共查询到20条相似文献，搜索用时 46 毫秒
1.
为对日长年际变化进行更细致分析,利用标准Morlet小波变换方法,从日长变化序列中识别和提取出6个主要的年际信号,周期分别为2.3 a（2.4 a）、3.3 a、3.7 a、4.8 a、6.1 a和8.1 a,并基于信号的时域提取结果,计算获得相应信号的平均振幅,依次为0.08 ms、0.05 ms、0.05 ms、0.07 ms、0.10 ms和0.07 ms。仿照提取出的6个日长年际信号,对大气角动量序列中相应的信号进行提取,并对两者进行相关性分析。结果显示,大气和日长对应的4个高频年际信号（2.3 a（2.4 a）、3.3 a、3.7 a和4.8 a信号）存在强相关,相关系数分别为0.99、0.93、0.99和0.91,且大气的激发贡献率依次为99.7%、63.1%、94.7%和69.3%,表明日长2.3 a（2.4 a）和3.7 a信号几乎完全可由大气解释,而大气也为其余2个日长信号的主要激发源;大气6.0 a、8.5 a信号与日长对应的6.1 a、8.1 a信号不相关或弱相关,相关系数分别为-0.11和-0.56。 相似文献
2.
提出一种基于球谐变换预测GERD水库蓄水过程中引起的地表形变的新方法。首先假定GERD水库分别在5 a、10 a、15 a间被注满,利用SRTM-DEM数据求取蓄水过程中每月水库的面积、体积和平均水高。经球谐展开后计算对应蓄水过程中引起的地表形变,并通过提高最大谐波度的上限来增加结果的精确度。3种蓄水策略下引起的垂向位移速率分别约为11.8 mm/a、5.9 mm/a、3.9 mm/a;引发的东向和西向位移速率分别约为1.8 mm/a和1.4 mm/a、0.9 mm/a和0.7 mm/a、0.6 mm/a和0.4 mm/a;引发的南向和北向位移速率分别约为2.6 mm/a和4.4 mm/a、1.3 mm/a和2.2 mm/a、0.8 mm/a和1.5 mm/a。 相似文献
3.
杨经铭 《广东海洋大学学报》2010,30(5)
建设和谐图书馆是一项长期的战略任务,馆员的审美精神对于和谐图书馆建设意义深远。阐述审美精神的内涵和基本特征,分析审美精神与图书馆精神的关系,探讨了高校图书馆馆员审美精神对和谐图书馆建设的意义,指出培育馆员审美精神的基本途径。 相似文献
4.
张虎才 《中国地理科学(英文版)》1998,8(4):377-382
ＧｅｏｌｏｇｉｃａｌｒｅｃｏｒｄｓｒｅｖｅａｌｅｄｔｈａｔｔｈｅＨｏｌｏｃｅｎｅｅｎｖｉｒｏｎｍｅｎｔｓｈａｄｅｘｐｅｒｉｅｎｃｅｄｄｒａｓｔｉｃｃｈａｎｇｅｓ,ｗｈｉｃｈｗａｓｃｌｏｓｅｌｙｒｅｌａｔｅｄｔｏｈｕｍａｎｅｖｏｌｕｔｉｏｎａｎｄｆｉｎ... 相似文献
5.
《中国海洋大学学报(英文版)》2021,20(4)
Relative dispersion ratio(RDR) can be used to quantify the deviation behavior of a water parcel's trajectory caused by a disturbance in a hydrodynamic system. It can be calculated by using a standard method for determining relative dispersion(RD),which accounts for the growth of the deviation of a cluster of particles from a specific initial time. However, the standard method for computing RD is time consuming. It involves numerous computations on tracing many water parcels. In this study, a new method based on the adjoint method is proposed to acquire a series of RDR fields in one round of tracing. Through this method,the continuous variation in the RDR corresponding to a time series of the disturbance time t can be obtained. The consistency and efficiency of the new method are compared with those of the standard method by applying it to a double-gyre flow and an unsteady Arnold-Beltrami-Childress flow field. Results show that the two methods have good consistency in a finite time span. The new method has a notable speedup for evaluating the RDR at multiple t. 相似文献
6.
Seismic wave modeling is a cornerstone of geophysical data acquisition, processing, and interpretation, for which finite-difference methods are often applied. In this paper, we extend the velocity-pressure formulation of the acoustic wave equation to marine seismic modeling using the staggered-grid finite-difference method. The scheme is developed using a fourth-order spatial and a second-order temporal operator. Then, we define a stability coefficient (SC) and calculate its maximum value under the stability condition. Based on the dispersion relationship, we conduct a detailed dispersion analysis for submarine sediments in terms of the phase and group velocity over a range of angles, stability coefficients, and orders. We also compare the numerical solution with the exact solution for a P-wave line source in a homogeneous submarine model. Additionally, the numerical results determined by a Marmousi2 model with a rugged seafloor indicate that this method is sufficient for modeling complex submarine structures. 相似文献
7.
毛妙维 《广东海洋大学学报》2006,26(2):115-120
电影不仅是作为一种艺术品,同时也是作为一种商品存在,而电影片名就好比是电影的一件外衣,因此,确切地翻译电影片名非常重要。电影片名的翻译技巧有很多,同时影响电影片名的翻译的因素也有很多。因此,在翻译电影片名时要从各方面因素考虑,从而选择恰当的翻译技巧,使得译名不仅能够从意义上忠实于源名,涵盖电影的内容,同时在形式上做到简练并具有吸引力。 相似文献
8.
阎怀兰 《广东海洋大学学报》2008,28(5)
中国民俗中对婴儿体貌的审美是以婴儿的生理特征为基础,认为身体白胖、脸庞丰满、额部高宽、头部圆大是形成婴儿体貌美的因素。这种婴儿的体貌美是一种趋向变形、夸张的美,是融合优美和滑稽美的审美形态。也是一种象征意义的美,具有深厚的中国民俗文化意蕴。反映了中国人特有的追求平安、健康的在世理想,以及特殊的求福、祈福文化和审美心理。 相似文献
9.
应用正规族理论及Zalcman引理,推广了Yuntong Li和Yongxing Gu一个亚纯函数正规性的定理,得到了下面的定理,即：设罗为复平面上一区域D上的亚纯函数族,k,n≥k＋2为正整数,a为非零有穷复数,L（f^n）的表达式为a0（f^n）^k）＋a1（f^n）^（k-1）＋…＋ak（fn）,其中a0≠0,a1,…,ak为复数,对任意的f,g∈F,L（fn）,L（gn）在D内分担a,则矿在D上正规． 相似文献
10.
Zhang Hucai 《中国地理科学(英文版)》1997,8(4):377-382
Chronology establishment and dating data analyses on lacustrine deposits in northeastern Sahara show that vast fresh lakes
existed over there between 9900–2400 a B. P. Especially, great continuous lakes developed and got their maximum extent during
the period from 9800 a B. P. to 6450 a B. P. From 6000 a B. P. to 3600 a B. P., the evolution of the lakes experienced a new
stage with a property of drastic fluctuations and a periodicity of 600 years, which was the response to the climatic environment
changes. On the aspect of the relation between natural environment and the human, the warm-humid period in the Holocene was
not only a very important time for human development and evolution, but also was a moment for human reproduction and division.
On the other hand, this warm-humid period was also a distinguished time to natural environment changes, the accumulation of
the strong weathered debris and fine materials formed the basements for the formation of the Sahara Desert.
Supported by the National Natural Science Foundation of China, German Research Foundation and Gansu Provincial Natural Science
Foundation. 相似文献
11.
Pen a 1 is a major shrimp allergen that induces an allergy. The aim of this study is to assess the effect of simulated gastrointestinal
fluids on the allergenicity of Pen a 1. Purified Pen a 1 from shrimp (Penaeus vannamei) was subjected to digestion in SGF (simulated gastric fluid) and SIF (simulated intestinal fluid) for a set time. The allergenicity
of digestive Pen a 1 was analyzed by immunoblotting and Ci-ELISA, using pool sera from patients with shrimp specific IgE.
The results showed that Pen a 1 exhibited a decrease in allergenicity with increasing digestion time in the SGF and SIF. However,
Pen a l exhibited strong resistance to digestive fluids, and all yielded fragments (33 kD, 23 kD, and 14 kD) showed allergic
activity. Therefore, anti-digestion may be an important factor for Pen a 1 to induce an allergy. 相似文献
12.
广西海洋资源丰富 ,品种繁多 ,为了更好开发 ,建议从法制、宣传教育、普及海洋资源有关知识 ,提高人们整体素质做起 ,进一步抓住机遇 ,合理开发 ,才能取得良好效益 ,达到预定目标 相似文献
13.
在对牛顿经典力学和爱因斯坦相对论对空间时间概念阐述的基础上,指出由于地壳运动是个宏观低速现象,因此完全可采用牛顿力学描述地壳质点在空间的位置以及在外力作用下该位置是如何随时间改变的,决定了必须选择一个不作加速度运动的参照系,才能正确使用牛顿定律对地壳运动进行正确的描述.因此满足牛顿惯性定律的参照系为地壳运动分析使用的坐... 相似文献
14.
为了得出一个超可解群的充分条件,利用有限群的π-拟正规子群和半覆盖远离子群的概念。群G的子群H称为G的π-拟正规子群,如果它与G的每一个Sylow子群可交换,群G的子群H称为G的半覆盖远离子群,如果H覆盖或者远离G的某个正规列的每一个正规因子。并将所得的结果推广到一些已知的结论。 相似文献
15.
To study the bubble plume’s seismic response characteristics, the model of a plume water body has been built in this article using the bubble-contained medium acoustic velocity model and the stochastic medium theory based on an analysis of both the acoustic characteristics of a bubble-contained water body and the actual features of a plume. The finite difference method is used for forward modelling, and the single-shot seismic record exhibits the characteristics of a scattered wave field generated by a plume. A meaningful conclusion is obtained by extracting seismic attributes from the pre-stack shot gather record of a plume. The values of the amplitude-related seismic attributes increase greatly as the bubble content goes up, and changes in bubble radius will not cause seismic attributes to change, which is primarily observed because the bubble content has a strong impact on the plume’s acoustic velocity, while the bubble radius has a weak impact on the acoustic velocity. The above conclusion provides a theoretical reference for identifying hydrate plumes using seismic methods and contributes to further study on hydrate decomposition and migration, as well as on distribution of the methane bubble in seawater. 相似文献
16.
证明了下面两个定理：（1）设n,k≥2为正整数,a为有穷非零复数,F为区域D上的亚纯函数族,F中任一函数的零点重级至少为k．vf,g∈F,fLn（f）与gLn（g）IM分担a．则F在D上正规,其中L（f）为f（k）＋a1f^（k-1）＋…＋akf,这里a1,…,ak为常数．（2）设n,k为正整数,且n≥2,a为有穷非零复数,F为区域D上的亚纯函数族,F中任一函数的零点重级至少为k,且fLn（f（z））=a能够推出｜f^（k）（z）｜≤A,其中A为正数,则F在区域D上正规． 相似文献
17.
Liquid sloshing is a type of free surface flow inside a partially filled water tank. Sloshing exerts a significant effect on the safety of liquid transport systems; in particular, it may cause large hydrodynamic loads when the frequency of the tank motion is close to the natural frequency of the tank. Perforated plates have recently been used to suppress the violent movement of liquids in a sloshing tank at resonant conditions. In this study, a numerical model based on OpenFOAM (Open Source Field Operation and Manipulation), an open source computed fluid dynamic code, is used to investigate resonant sloshing in a swaying tank with a submerged horizontal perforated plate. The numerical results of the free surface elevations are first verified using experimental data, and then the flow characteristics around the perforated plate and the fluid velocity distribution in the entire tank are examined using numerical examples. The results clearly show differences in sloshing motions under first-order and third-order resonant frequencies. This study provides a better understanding of the energy dissipation mechanism of a horizontal perforated plate in a swaying tank. 相似文献
18.
为了研究寻找一般平衡问题的公共解集中共有元素的迭代方法,及无穷非扩张映像族的不动点问题.通过在Hilbert空间中构造非扩张序列Ti得出了一种关于Wn算子的新黏性逼近迭代算法,在一定条件下,得出了其强收敛定理. 相似文献
19.
用RT-PCR和RACE方法,从荷那龙罗非鱼(Oreochromis hornorum)垂体中克隆到生长激素促分泌素受体(GHSR)cDNA全序列。荷那龙罗非鱼GHSR基因具有GHSR-1a与GHSR-1b两个高度保守cDNA序列。GHSR-1a序列全长1 646 bp,包括225 bp的5′非编码区,266 bp的3′非编码区和1 155 bp的开放阅读框,编码384个氨基酸残基,具有7个跨膜结构域结构(transmembrane domains,TM);GHSR-1b序列全长1 877 bp,包括225 bp的5′非编码区,755 bp的3′非编码区和897 bp的开放阅读框,编码298个氨基酸残基,只具有前5个TM,在第6个TM的第4个氨基酸处开始缺失。将GHSR cDNA序列与基因组序列比较发现,这两种cDNA转录本来自同一个基因的不同变体。 相似文献
20.
王汝楠 《地球信息科学学报》2006,8(3):131-133
地壳板块的形成,是由于外来星球的撞击而造成的。太平洋就是巨大的撞击坑,大西洋则是撞击产生的地球背面的S形裂谷。地球上的水,也很有可能主要来源于这次撞击。 相似文献