A combined numerical tidal model for the Hangzhou Bay and Qiantang River

-In order to avoid prescribing open boundary condition on the upstream side of the Hangzhou Bay, in numerical simulation of the tides and residual currents of the Bay, a 1-D model for the Qiantang River is connected to the 2-D model for the Hangzhou Bay. The harmonic constants of diurnal constituent [ (K1 O1)/2],semidiurnal constituent (M2) and shallow water constituent (M4) are obtained. The results produced by the combined model are in better agreement with the observed ones than those produced solely by the original 2-D model. The combined model gives much more reliable results for tide-induced residual water level and current.     

不同生长期坛紫菜多糖中组分含量的变化

于１９９０－１９９１年，运用＾１３Ｃ－ＮＭＲ和化学分析方法研究南方产和移植北方养殖的不同生长发育阶段坛紫菜多糖的组分变化，结果表明，随着藻体生长发育，坛紫菜琼胶中３，６－内醚－Ｌ－半乳糖和６－ＯＣＨ３－Ｄ－半乳糖的含量逐渐增加，而硫酸基的含量呈现先增加后减少的规律；北移坛紫菜琼胶中３，６－内醚－Ｌ－半乳糖的含量高于南方坛紫菜，而硫酸基和６－ＯＣＨ３－Ｄ－半乳糖的含量低于南方坛紫菜。     

Study on the negative bias temperature instability effect under dynamic stress

This paper studies negative bias temperature instability (NBTI) under alternant and alternating current (AC) stress. Under alternant stress, the degradation smaller than that of single negative stress is obtained. The smaller degradation is resulted from the recovery of positive stress. There are two reasons for the recovery. One is the passivation of H dangling bonds, and another is the detrapping of charges trapped in the oxide. Under different frequencies of AC stress, the parameters all show regular degradation, and also smaller than that of the direct current stress. The higher the frequency is, the smaller the degradation becomes. As the negative stress time is too small under higher frequency, the deeper defects are hard to be filled in. Therefore, the detrapping of oxide charges is easy to occur under positive bias and the degradation is smaller with higher frequency.     

Some considerations on the recent tectonic stress field of China

Based on the improved hydrofracturing method, the in-situ principal stresses are determined in the north, northeast, south and the northwest of China, and the results of many fault-plane solutions, crustal deformations, geological and geophysical observations are used to discuss the distribution of subcrustal stress in space, the difference between seismically active regions and stable regions, and the variations of the stress field near the source region before and after the Tangshan earthquake. Finally, the characteristics of intraplate tectonic stress fields in China are explained in relation with the combined actions of the movement of the major Indian Ocean, Pacific and Philippine Sea plates.     

京西北地区地应变观测与小震震源机制解一致性研究

以京西北地区作为研究区域,采用应变参数方法解算定点地应变观测数据,将所得应变参数时间序列作为研究对象,利用该结果与研究区内同期小震震源机制解进行一致性分析,研究得出呈拉张性质的定点观测最大主应变方位与震源机制解最大拉张变形方向（T轴）水平投影具有良好的对应性,整体以NNW—NE向为主,且自西向东排布的测点最大主应变方位与震源机制解最大拉张变形方向均表现为逐渐东向偏移的趋势,与华北平原块体北部发生顺时针旋转活动的特征相吻合,结果进一步检验了地应变观测反映区域应变场信息的能力。     

聊城市地下水开采和补源的研究分析

地下水是聊城市重要的而且是主要的水资源,近年来,地下水的开采和补源引起了人们的广泛关注.本文拟对地下淡水资源的时空分布、运动规律、地下水资源计算和评价及聊城市地下水开发利用问题进行一些探讨,对于引黄(河)灌区合理引用黄河水和开采地下水具有重要的指导作用和应用价值.     

Direct constraint on cosmic neutrino mass using observational Hubble parameter data

In order to explore the properties of cosmic neutrinos, i.e. sum of the neutrino mass(∑m_ν) and the effective number of neutrino species(N_(eff)), which affects the Hubble expansion rate H(z)and the power of observational Hubble parameter data(OHD) in constraining cosmological parameters under the ΛCDM model, we utilize OHD to constrain the properties of cosmic neutrinos and apply an accurate H(z) function with mνand Neff. First, we simulate new OHD beyond the existing 43 OHD. According to the predictions of measurements of H_0(the current H(z) value), baryon acoustic oscillations(BAO) peaks, Sandage-Loeb(SL) test and cosmic microwave background(CMB), we assume observational accuracy up to 2% and redshift 0 z ≤5. With simulated H(z) data obtained from the fiducial model, we constrain the parameters including mνand Neff. When all parameters are set free, mν 0.196 eV(95%) and N_(eff)= 2.984 ± 0.826(68%) are obtained, and when fixing Neff as the standard baseline 3.046, we attain ∑m_ν 0.240 eV(95%). These constrained results are much tighter than the ones obtained by the current OHD, which makes the prospect of OHD in constraining cosmological parameters more promising as its accuracy and quantity grow.     

Win View软件在云台1m望远镜上的应用

ＷｉｎＶｉｅｗ是一个用于图像采集和处理的高性能软件包。作为一个商业性的软件，在天文上的应用正日益广泛。本文结合配套的硬件设备，详细介绍了它的主要功能及在天文观测中的应用，以期对使用这套设备的观测者有所帮助     

Study on the Period Changes of xy Leonis

XY Leo (BD+18° 2307, p = 0d .28) was observed each season from 1992 through 1995 at Yunnan Observatory with the 1 m telescope and 37 new heliocentric times of minimum light were determined. The newly expanded database of the minimum times,including these new epochs, definitely confirm the sine-like variation of its O–C values. Observations and analyses strongly supported the viewpoint that the variation of the O–C values of the minimum times is mainly caused by the light- time effect. Based on this newly expanded database, new light elements for the eclipsing system XY Leo and new light-time orbit for this complex system have been obtained with much better accuracy than before by means of the least squares fitting to the light-time equation. It's also noted that the additional period variation for XY Leo probably may not be ruled out besides the light-time effect. The method of analysis and the discussion of the results are presented in this paper. This revised version was published online in July 2006 with corrections to the Cover Date.     

Improved understanding of petroleum migration history in the Hongche fault zone,northwestern Junggar Basin (northwest China): Constrained by vein-calcite fluid inclusions and trace elements

Calcite veins and cements occur widely in Carboniferous and Permian reservoirs of the Hongche fault zone, northwestern Junggar Basin in northwest China. The calcites were investigated by fluid inclusion and trace-element analyses, providing an improved understanding of the petroleum migration history. It is indicated that the Hongche fault behaved as a migration pathway before the Early Cretaceous, allowing two oil charges to migrate into the hanging-wall, fault-core and footwall reservoirs across the fault. Since the Late Cretaceous, the Hongche fault has been sealed. As a consequence, meteoric water flowed down only into the hanging-wall and fault-core reservoirs. The meteoric-water incursion is likely an important cause for degradation of reservoir oils. In contrast, the footwall reservoirs received gas charge (the third hydrocarbon event) following the Late Cretaceous. This helps explain the distribution of petroleum across the fault. This study provides an example of how a fault may evolve as pathway and seal over time, and how reservoir diagenetic minerals can provide clues to complex petroleum migration histories.