南海ODP1148站33Ma以来的沉积矿物组成通量及其构造响应

摘 要 矿物是沉积物的主要成分，其陆源组分经过地表径流或风带到海洋，直接或间接地沉积下来。海洋中陆源矿物的多寡反映了物源供给和输送动力的强弱，从长尺度看受构造活动和地貌演化所控制，因此大的构造运动必然在相邻边缘海沉积的陆源组分和通量变化中留下烙印。 新生代南海海盆经历了两次扩张，第二次扩张发生在32～15.5 Ma，这次扩张使东北巴拉望地块向南漂移，形成了南海中央海盆。青藏高原的隆升具有分阶段不均匀性，目前研究认为渐新世以来青藏高原快速隆升的时代有25～17 Ma，13～8 Ma 和3.4 Ma～现今。为了探明青藏高原加速隆升和南海构造扩张在南海沉积中的响应，我们对ODP 184 航次在中国南海1148站取得的沉积物进行了矿物学分析。通过化学提纯分离方法获得陆源矿物，粘土矿物，长石矿物、石英的含量以及它们的通量；通过X射线衍射分析获得粘土矿物的组成并估算了各组分的沉积通量；用激光粒度仪分析了陆源物质的粒度。 利用以上分析的结果和本航次的年代数据获得33 Ma以来的沉积矿物的含量、通量和陆源物质粒度随时间变化曲线。在此基础上讨论了33 Ma来南海陆源矿物含量和通量对南海构造扩张及青藏高原隆升的响应。结果发现南海28.5 Ma之前的沉积矿物组成与沉积通量同南海海底构造扩张的开始和脊跳跃有关；23.5 Ma之后的沉积受青藏高原隆升影响，青藏高原在25～17 Ma，13～8 Ma 和3.4～present的加速隆升南海沉积物中均有反映，尤其是3.4 Ma以来的快速隆升，在沉积矿物中的反映非常明显。从23.5 Ma开始，1148 站陆源矿物的源区从东南变到西北，这是因为随着南海海底扩张，南部物源远离沉积站位从而影响减弱；同时，青藏高原隆升导致地表剃度增加，河流转向与侵蚀加强并开始影响到南海。

双奇核~(184)Au中πi_(913/2)νi_(13/2)转动带的结构特征研究

利用重离子熔合蒸发反应和在束γ谱学实验方法 ,研究了双奇核184 Au的高自旋态能级结构 .扩展了基于πh9/ 2 ν7/ 2 - [5 14 ]和πi13/ 2 νi13/ 2 2准粒子组态下的转动带能级纲图 ,建立了两个转动带之间以及πh9/ 2 ν7/ 2 - [5 14 ]带与基态的谱学连接 .从而确定了πi13/ 2 νi13/ 2 带能级的自旋和宇称 ,证实了此转动带在低自旋区出现旋称反转 .分析了πi13/ 2 νi13/ 2 带和相邻核转动带的准粒子顺排特征 ,指出此带的第一回弯以及相邻核转动带在低频观测到的顺排异常可能与h9/ 2 质子顺排有关 .

Search for signature inversion in the pi i(13/2) circle times upsilon i1(3/2) bands in Au-182,Au-184,Au-186

Search for low-spin signature inversion in the pi i(13/2) circle times nu i(13/2) bands in odd-odd Au-182,Au-184,Au-186 has been conducted through the standard in-beam gamma-spectroscopy techniques. The experiments for Au-182 and 186Au have been performed in the Japan Atomic Energy Agency (JAEA) via the Sm-152(Cl-35,5n)Au-182 and Yb-172(F-19,5n)Au-186 reactions, respectively. A study of Au-184 has been made using a multi-detector array GASP in LNL, Italy, via the Tb-159(Si-29,4n)Au-184 reaction. The pi i(13/2) circle times nu i(13/2) bands in these three nuclei have been identified and extended up to high-spin states. In particular, the inter-band connection between the pi i(13/2) nu i(13/2) band and the ground-state band in 184 Au has been established, leading to a firm spin-and-parity assignment for the pi i(13/2) circle times nu i(13/2) band. The low-spin signature inversion is found in the pi i(13/2) circle times nu i(13/2) bands in Au-182,Au-184,Au-186 according to our spin-assignment and the signature crossing observed at high-spin states.

Search for signature inversion in the pi i(13/2)circle times nu i(13/2) bands in Au-182,Au-184,Au-186

Search for low-spin signature inversion in the pi i(13/2) circle times nu i(13/2) bands in odd-odd Au-182,Au-184,Au-186 has been conducted through the standard in-beam gamma-spectroscopy techniques via the Sm-152(Cl-35,5n) Au-182, Yb-172(F-19,5n) (186)An, and Tb-159(Si-29,4n) (184)An reactions, respectively. The pi i(13/2) circle times nu i(13/2) bands in these three nuclei have been identified and extended up to high-spin states. In particular, the inter-band connection between the pi i(13/2) circle times nu i(13/2) band and the ground-state band in Au-184 has been established, leading to a firm spin-and-parity assignment for the pi i(13/2) circle times nu i(13/2) band. The low-spin signature inversion is found in the pi i(13/2) circle times nu i(13/2) bands according to our spin-assignment and-the signature crossing observed at high-spin states.

The first molluscan TCTP in Venerupis philippinarum: Molecular cloning and expression analysis

Translationally controlled tumor protein (TCTP) is one of the abundant and ubiquitously expressed proteins in metazoans In the present study, the first molluscan TCTP (denoted as VpTCTP) was identified from Venerupis philippinarum haemocytes by EST and RACE approaches The full-length cDNA of VpTCTP consisted of 1148 nucleotides with an open-reading frame of 555 bp encoding 184 amino acids The deduced amino acid sequence of VpTCTP shared high similarity with TCTPs from other species, indicating that VpTCTP should be a new member of TCTP family Several highly conserved motifs, including 5'terminal ologopyrimidine (5'TOP) starting sequence and rich AU and AUUT elements in 3'UTR, were also identified in VpTCTP The tissue and temporal expression of VpTCTP after Vi boo anguillarum challenge was recorded by quantitative real-time RT-PCR. VpTCTP transcript could be detected in all examined tissues with the highest expression level in haemocytes and the lowest in hepatopancreas Concerning the time-course expression in haemocytes, the relative expression of VpTCTP mRNA was down-regulated sharply from 6 h to 12 h post-infection. Then, the expression level was obviously up-regulated and reached 3.4-fold to that in the control group at 48 h post challenge As time progressed, the expression of VpTCTP recovered to the original level at 96 h. All these results indicated that VpTCTP was an acute-phase protein involved in the Immune response of V philippinarum (C) 2010 Elsevier Ltd. All rights reserved.

Gas hydrate occurrence on the continental slope of the northern South China Sea

High-resolution multi-channel seismic data and geological samples were collected during two research cruises of the R/V FENDOU 4 in 1999 and 2000. Studies on these data and samples together with results from sites 1143-1145 and 1148 of ODP Leg 184 suggest that the geological structure on the continental slope of the northern South China Sea is favorable for the formation of gas hydrates. Bottom simulating reflectors (BSRs) and geochemical anomalies which indicate the existence of gas hydrates have been recognized in sediments of the Xisha Trough, the Dongsha Rise and the accretionary wedge of the Manila subduction zone. These gas hydrates are generated by two different mechanisms depending on the tectonic regime and the seismic and geochemical characteristics. The first applies to the passive continental margin of the nor-them South China Sea on the Dongsha Rise and in the Xisha Trough. The gas hydrates are associated with diapiric structures, active faults, slumps and gravity flows as well as high Late Cenozoic sedimentation rates. Their seismic expression includes BSRs, seismic blanking zones and velocity anomalies. The second mechanism is operative on the active continental margin along the Manila subduction zone, especially in the accretionary wedge. Here, gas hydrate occurrence is marked by widespread BSRs and acoustic 'pull-down' possibly related to the existence of free gas in the sediments beneath the BSR. The thickness of the seismic blanking zones averages 250 m, suggesting that the stable gas hydrate zone has about the same thickness. (c) 2005 Elsevier Ltd. All rights reserved.

Development of the East Asian summer monsoon: Evidence from the sediment record in the South China Sea since 8.5 Ma

128 samples from Ocean Drilling Program (ODP) Site 1143 in the southern South China Sea were analyzed for grain size, clay minerals, biogenic opal content and quartz in order to reconstruct changes in East Asian monsoon climate since 8.5 Ma. An abrupt change of terrigenous mass accumulation rate (MAR), clay mineral assemblage, median grain size and biogenic opal MAR about 5.2 Ma suggests that between 8.5-5.2 Ma the source of terrigenous sediment was mainly in the region of surface uplift and basaltic volcanism in southern Vietnam. A simple model of East Asian summer monsoon evolution was based on the clay/feldspar ratio, kaolinite/chlorite ratio and biogenic opal MAR. The summer monsoon has two periods of maximum strength at 8.5-7.6 Ma and 7.1-6.2 Ma. Subsequently, there was a relatively stable period at 6.2-3.5 Ma, continued intensification about 3.5-2.5 Ma, and gradually weakening after 2.5 Ma. Since I Ma the monsoon has intensified, with remarkable high-frequency and amplitude variability. Simultaneous increase in sedimentation rates at ODP Sites 1143, 1146 and 1148, as well as in MAR of terrigenous materials, quartz, feldspar and clay minerals at ODP Site 1143 at 3.5-2.5 Ma, may be the erosional response to both global climatic deterioration and the strengthening of the East Asian summer monsoon after about 3-4 Ma. (c) 2006 Elsevier B.V. All rights reserved.

从能斯特定理导不出绝对零度下热容量的零极限

证明一些文献从能斯特定理终结式导出等容热容量和等压热容量在绝对零度下的零极限limT→0CV=0和limT→0Cp=0的有关推导不成立,并证明不可能从能斯特定理或其终结式导出这些结论.但如果把普朗克的绝对熵原理作为热力学第三定律的基本表述形式,则由此可以导出等容热容量和等压热容量的零极限.

Influence of Obstacle-Produced Turbulence on Development of Premixed Flames

An investigation into influence of obstructions on premixed flame propagation has been carried out in a semi-open tube. It is found that there exists flame acceleration and rising overpressure along the path of flame due to obstacles. According to the magnitude of flame speeds, the propagation of flame in the tube can be classified into three regimes: the quenching, the choking and the detonation regimes. In premixed flames near the flammability limits, the flame is observed first to accelerate and then to quench itself after propagating past a certain number of obstacles. In the choking regime, the maximum flame speeds are somewhat below the combustion product sound speeds, and insensitive to the blockage ratio. In the more sensitive mixtures, the transition to detonation (DDT) occurs when the equivalence ratio increases. The transition is not observed for the less sensitive mixtures. The dependence of overpressure on blockage ratio is not monotonous. Furthermore, a numerical study of flame acceleration and overpressure with the unsteady compressible flow model is performed, and the agreement between the simulation and measurements is good.

双自由面重力流的数值保角变换方法——(Ⅱ)数值方法

本文是文献[1]的继续。在薄壁堰双自由面泄流问题数学模型的基础上,本文进一步发展了该问题的一种数值离散和数值计算方法,包括不同单元插值函数的选取、边界奇异积分的处理等。文中选取倾角为45°薄壁堰泄流流动进行了数值计算,所得上、下两自由面位置和泄流流量与实测或分析值吻合很好。全文得出了一些有益的结论。