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常梯度射线追踪法及在vsp-cdp成像中的应用  [PDF]
蔡露露,孙赞东,白海军,郝会民
石油地球物理勘探 , 2011,
Abstract: ?本文用常速度梯度射线追踪法进行反射波的射线追踪,并结合两步法和插值逼近法求解两点射线追踪问题,最后将该方法应用于vsp-cdp成像中。对模型资料和实际资料进行试算结果表明:两步法结合插值逼近法能较好地解决复杂速度场的两点射线追踪收敛问题,但两步法只对二维速度模型有效,对于三维模型的两点射线追踪问题,仍使用文中式(11)给出的三角形面积加权的插值逼近法。
考虑服务商风险规避度和垫资能力的研发外包合同设计  [PDF]
宋寒,邵云飞,毛慧颖,代应
- , 2017,
Abstract: 针对研发外包中服务商道德风险防范与激励问题,在考虑服务商风险规避度和垫资能力的情况下,设计了收益共享研发外包合同,分析了服务商风险规避度和垫资能力对固定支付、收益共享系数以及服务商最优研发投入的影响.研究表明,当风险规避度大于阀值时,客户在研发合同设计时不用考虑服务商垫资能力问题,因为服务商不会接受垫资;当风险规避度小于阀值时,研发合同设计中需要进一步考虑服务商垫资能力,特别是当服务商风险规避度特别小的时候,针对不同垫资能力的服务商,随着服务商垫资能力的增加,客户最优的研发外包固定支付先减少,后达到稳定不变,但客户最优的研发外包收益共享系数却是先不变,后增加,最后达到稳定不变.
混合域三维vsp波动方程深度偏移方法  [PDF]
牟风明,王成礼,韩文功,王延光
石油地球物理勘探 , 2008,
Abstract: ?常规vsp成像方法利用vsp-cdp转换或基尔霍夫偏移,存在保幅性差及成像精度低等问题。混合域三维vsp波动方程深度成像方法是将vsp反射p波在深度域直接成像,利用分步傅里叶法在混合域进行波场外推,即在频率—波数域实现波场的相移,在频率—空间域实现时移校正。此法的优点在于能保持横向变速地质构造波动方程波场外推精度的同时提高计算效率。理论模型证明此方法可行,实际资料处理效果明显。
Optical properties of CdP2 and CdP4 nanoparticles incorporated into Na-X zeolite matrix  [PDF]
O. A. Yeshchenko,I. M. Dmitruk,S. V. Koryakov,Yu. A. Barnakov
Physics , 2004,
Abstract: For the first time nanoparticles of CdP2 and CdP4 semiconductors were prepared and studied. The nanoparticles were prepared by incorporation into zeolite Na-X matrix. Absorption and photoluminescence (PL) spectra of CdP2 and CdP4 nanoparticles were measured at the temperature of 77 K. Two bands were observed in both the absorption and PL spectra of CdP2 nanoparticles demonstrating the blue shift from the line of free exciton in bulk crystal. Single band was observed in both the absorption and PL spectra of CdP4 nanoparticles demonstrating the blue shift from the spectra of bulk crystal. We attribute the bands to some stable nanoparticles of CdP2 and CdP4 with size less than the size of zeolite Na-X supercage. We observed Stokes shift of the PL bands with respect to the absorption bands for both CdP2 and CdP4 nanoparticles.
vsp激发方式选择分析  [PDF]
范晓南,曹立斌,钟萍,文向东
天然气工业 , 2009,
Abstract: ?为满足实际生产对vsp资料的更高要求,除了加快采集设备和处理软件的更新外,激发方式也是一个不容忽视的重要问题。在川渝地区,长期以来都采用“水炮”作为震源来采集vsp资料,并且认为“水炮”激发方便、资料一致性较好,是vsp资料采集的理想震源,但是在川中、川中—川南过渡带上用水炮采集的vsp资料往往出现主频低、频带窄、波组不齐全的问题,在很大程度上影响了vsp技术的应用效果和推广。以bq205井vsp测井为例,对“井炮”和“水炮”激发采集的vsp资料从子波一致性、能量的稳定性、分辨率的高低等方面进行了对比分析,认为在低降速带较厚的地区,“井炮”激发采集的vsp资料比“水炮”激发的子波一致性要好、能量的稳定性更优、抗低频的能力更强、分辨率更高。这一结论对四川盆地vsp资料采集及其推广应用具有指导意义。
方位各向异性介质的VSP资料处理  [PDF]
方伍宝
地球学报 , 1996,
Abstract: 本文从理论上推导了二维EDA介质中的弹性波动方程,并对其进行了数值模拟,获得了当坐标系旋转30°时用点源激发的三分量波场切片及用相互正交的横波震源在同一位置激发,用两个相互正交的水平检波器接收的四分量全成记录。用双源四分量同时旋转方法对从两种EDA介质中采集的四分量作分析,得到了分裂的快,慢横波分量和它们间的时间延迟以及介质的裂隙方位角。从分离的快横波分量中提取反射能量,然后用VSP-CDP变换方法作成像处理。
通过交联度控制β-环糊精聚合物对药物的载入与释放  [PDF]
王齐放,李三鸣*,张予阳,张弘
药学学报 , 2011,
Abstract: 本研究使用具有不同交联度(cld)的β-环糊精聚合物(β-cdp)为载体与布洛芬形成包合物,考察β-cdp结构和组成对药物载入和释放的影响。通过ft-ir和13cnmr确定β-cdp结构特征。结果表明在β-cdp中仍保留β-cd的原有结构特征。β-cdp的cld是决定药物载入及释放的重要因素,增加β-cdp的cld会使药物的载入量减少,释放量增大。
Fabrication, Study of Optical Properties and Structure of Most Stable (CdP2)n Nanoclusters  [PDF]
O. A. Yeshchenko,I. M. Dmitruk,S. V. Koryakov,M. P. Galak
Physics , 2005, DOI: 10.1016/j.physe.2005.07.019
Abstract: CdP2 nanoclusters were fabricated by incorporation into pores of zeolite Na-X and by laser ablation. Absorption and photoluminescence (PL) spectra of CdP2 nanoclusters in zeolite were measured at the temperatures of 4.2, 77 and 293 K. Both absorption and PL spectra consist of two bands blue shifted with respect to bulk crystal. We performed the calculations aimed to find the most stable clusters in the size region up to size of the zeolite Na-X supercage. The most stable clusters are (CdP2)6 and (CdP2)8 with binding energies of 9.30 eV and 10.10 eV per (CdP2)1 formula unit respectively. Therefore, we attributed two bands observed in absorption and PL spectra to these stable clusters. The Raman spectrum of CdP2 clusters in zeolite was explained to be originated from (CdP2)6 and (CdP2)8 clusters as well. The PL spectrum of CdP2 clusters produced by laser ablation consists of the asymmetric band with low-energy tail that has been attributed to emission of both (CdP2)8 cluster and CdP2 microcrystals.
四狗追戏问题的其他解法  [PDF]
朱晨
力学与实践 , 2000, DOI: 10.6052/1000-0992-f2000-058
Abstract: 本文通过直角坐标法及极坐标法求解四狗追戏问题.
vsp多波旅行时反演  [PDF]
谢春辉,孙赞东,王学军,杨午阳
石油地球物理勘探 , 2011,
Abstract: ?本文基于几何地震学原理,分别利用vsp直达波、反射纵波及上行转换横波旅行时反演层速度。直达波旅行时反演只能获得检波点所在井段地层的速度;上行纵波旅行时反演能获得最深检波器以下地层的速度,即井底以下地层的速度;上行转换横波旅行时反演则能获得横波速度。本文主要研究利用vsp直达波和上行反射波求取井段及井底以下地层的速度,最终根据三维vsp资料获取三维速度体。
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