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1.
A new genus and a new species have been established on the basis of three specimens collected from Fujian's coastal zone in China. This new genus is named Laevispinereis. Its brief characters are as follows: oral ring of proboscis has papillae, maxillary ring has conical paragnaths; the peristomium greatly expands into a collar; notosetaes are homogomph spinigers, neurosetaes are homogomph spinigers and homogomph falcigers; tip of spinigers setae with minute serratures and smooth on side. The type of genus is Laevispinereis fujianensis sp. nov., it has conical paragnaths on maxillary ring of proboscis: I has Ⅰ; Ⅱ has 6-7: Ⅲ has 12;Ⅳ has 6-7. 相似文献
2.
Euniphysa, originally a genus of the family Eunicidae, was erected by Wesenberg-Lund in 1949, and for a longtime there has been only one species in this genus. The present report is based on our samples collected from the South China Sea, and we consider that the differences between Euniphysa and Eunice are very significant: Five occipital tentacles distributed unequidistantly; the jaw consists of 6 pairs of maxillary plates; the body may be divided into anterior region and posterior region, etc. Therefore we suggest that Euniphysa should be separated from Eunicidae, and become a new family Euniphysi-dae. At present this family includes 3 genera, namely, Euniphysa , Paraeuniphysa and 1 new genira Heterophysa; Totally there are 7 species, including 3 new species and 1 new combination species. 相似文献
3.
One new species and two new records of free-living marine nematodes from the Huanghai Sea 总被引：4，自引：3，他引：1
1 IntroductionIn January 2003, undisturbed sediments were tak-en from a grid of 22 sampling stations (from 32.5° to37°N, 122° to 125°E) during the cruise of an ecologi-cal survey of the over-winter ground for anchovy inthe Huanghai Sea. Meiofaunal abundance varied from55.3 to 152.0 ind/cm2 [(95.4 ±27.0) ind/cm2], with81% to 93% [(83.1 ±22.7) ind/cm2] of the specimensbeing nematodes. Up to now, twenty-nine species ofmarine nematodes have been recorded from theHuanghai Sea (Zhang and P… 相似文献
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5.
A new form of higher order Boussinesq equations 总被引：3，自引：0，他引：3
On the basis of the higher order Boussinesq equations derived by the author (1999), a new form of higher order Boussinesq equations is developed through replacing the depth-averaged velocity vector by a new velocity vector in the equations in order to increase the accuracy of the linear dispersion, shoaling property and nonlinear characteristics of the equations. The dispersion of the new equations is accurate to a [4/4] Pade expansion in kh. Compared to the previous higher order Boussinesq equations, the accuracy of quadratic transfer functions is improved and the shoaling property of the equations have higher accuracy from shallow water to deep water. 相似文献
6.
A new method for inversion of gravity field using the technique of inverse filtering is presented in this paper to calculate the structure of crust.After inversing gravity data of West Pacific and Okinawa Trough, it has been proven that the method of inverse filtering has many advantages, such as high accuracy, fast convergence rate, small memory space used and arbitrary reduction of sampling interval. This new method is convenient to minicomputer for solving the inverse problem of crustal structure. 相似文献
7.
Unrepresentative subsamples can be obtained from a sedimentary sample through repeated subdivision when using a mechanical microsplitter. Physical biases are often compounded by repetition and can result in wide variations among the estimates computed from the relative proportion of foraminifera of a given species. A new microsplitter, designed on a new principle, has been built to separate small representative subsamples. The device is based on the uniform distribution of unconsolidated sediments suspended in water. A subsample of the desired size is obtained by collecting sediment from an appropriate sedimentation area. Operation of this sampler is rapid and convenient and requires only one step, thus eliminating sampling biases introduced by repeated operations with other splitters. This new device was tested and found to be superior to the Otto Microsplitter according to some statistical goodness-of-fit tests conducted on the series. 相似文献
8.
A survey on Anthomedusae(Hydrozoa: Hydroidomedusae) from the Taiwan Strait with description of new species and new combinations 总被引：5，自引：2，他引：5
New data on Anthomedusae are included. Seven new species and 2 new combinations are described. An additional Teissiera polypofera Xu, Huang and Chen, 1991 is redescribed and its position of taxonomy is discussed. Other lists of species on Anthomedusae are summarized. 相似文献
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The physical simulation of tsunami in the laboratory has taken a major leap forward with the construction and testing of a new wave generator, capable of recreating scaled tsunami waves. Numerical tools fail to reproduce tsunami nearshore and onshore processes well, and physical experiments in large scale hydraulic facilities worldwide have been limited to the generation of solitary waves as an (controversial) approximation for evolved forms of tsunami. The new concept in wave generation presented herein is born of collaboration between UCL's Earthquake and People Interaction Centre (EPICentre) and HR Wallingford. It allows for the first time the stable simulation of extremely long waves led either by a crest or a trough (depressed wave). This paper presents the working concepts behind the new wave generator and the first stages of testing for verifying its capacities and limitations. It is shown that the new wave generator can not only reproduce solitary waves and N-waves with large wavelengths, but also the 2004 Indian Ocean Tsunami as recorded off the coast of Thailand (“Mercator” trace). 相似文献
11.
矢量传感器是一种新型水声传感器。介绍了应用矢量传感器确定目标方位的理论和方法，给出了仿真和实验研究结果，讨论了矢量传感器具体体积小、输出信号多、抗各向同性干扰等特性。最后定性地分析了目标方位的方位估值误差。 相似文献
12.
In planktonic diatom samples collected from Xiamen Harbour, Xiamen,Fujian,China from January 1983 to December 1984, two species and varieties are new to science and three species are recorded for the first time in China. New species is Tropidoneis constricta Li,Cheng et Chin sp. nov. ,new variety is Fragilaria longissima v. protenta Li,Cheng et Chin var. nov. ,new recorded species are FragUaria heidenii Ostrup.F.oceanica Cleve and Thalassiosira punctigera Hasle. 相似文献
13.
Abstract Tsunami research has suffered considerably due to the lack of an objective magnitude scale. The Imamura‐Iida Grade Scale, although it has been used until now as a magnitude scale, is not objective, and it is more appropriate to call it a tsunami intensity scale. The tsunami magnitude scale proposed by Abe (1979) is also based on coastal tide gauge records, and this is not truly an objective magnitude scale. A new magnitude scale is proposed here, based on total tsunami energy, and it is demonstrated that this new scale will provide an adequate representation of the whole spectrum of tsunamis, starting from the negligible ones and including those that have devastated whole coastlines. 相似文献
14.
开发了一种新型平台桩靴,可通过活动板转动实现自升式平台不同阶段桩靴受力面积的灵活变化。基于大变形有限元方法,模拟新型桩靴基础在“砂-黏”地层中的贯入过程,分析了活动板转角、砂层厚度比、摩擦角和黏土层不排水抗剪强度对新型桩靴贯入阻力的影响,并与普通桩靴的贯入响应比较。数值分析中,上覆砂土和下层黏土分别采用摩尔库伦模型和修正Tresca模型进行模拟。结果表明：新型桩靴穿刺时,土层参数对峰值阻力的影响规律与普通桩靴相同,但其峰值阻力随活动板转角的变化而变化,无法直接使用具有等效面积普通桩靴的穿刺预测方法。考虑各项关键影响因素,结合穿刺破坏时的地基破坏模式,基于数值模拟结果提出了适用于新型桩靴的贯入阻力预测公式。 相似文献
15.
FPSO系统在深海海洋油气资源开发中扮演着重要的角色,而深水FPSO系统水下立管管路较长,立管整体重量较大,立管在水流作用下产生的涡激振动也较强,这些将给FPSO主船体带来严重的稳性、强度及疲劳问题。鉴于此,深海FPSO系统在油气资源开发过程中,须在水下一定深度设置若干水下软管支撑浮体,用以支撑来自深海海底的管线,减轻深水立管对FPSO的负载作用。随着深海资源开发的深入发展,传统水下软管支撑浮体作为FPSO系统的关键装备已经无法满足深海开采的需求,寻求大型化、深海化、生命周期长久化的新型水下立管支撑平台迫在眉睫,设计简便快捷、低风险的安装方法成为其开发过程中的重点和难点。详细描述了水下软管支撑浮体的产生及其发展历程,针对深海开发的需求提出了新型立管支撑平台的新概念,着重对新概念下下水安装更便捷的耐压立管支撑平台设计原理及其下水安装方式展开了分析,最后对水下软管支撑浮体和新型立管支撑平台的关键技术进行了总结,并提出了需进一步解决的问题。 相似文献
16.
A new equation of state for the Aral Sea is proposed. The equation expresses the dependency of the density on the temperature
and salinity. It corresponds to the contemporary salinity range and the ionic salt composition as observed in 2007. The equation
was obtained based on direct density measurements using a high precision vibration beam densimeter; therefore, it does not
rely on any a priory assumptions about the ionic composition. The accuracy of the density calculations from the new equation
of state significantly exceeds that from the extrapolation of the oceanic equation. 相似文献
17.
The front slope stability of breakwaters with a homogeneous berm was studied in a large number of two dimensional model tests at Aalborg University, Denmark. The results are presented together with a new formula for prediction of the berm recession which is the most important parameter for describing the reshaping. The formula has also been calibrated and validated against model test data from other researchers. The significance of the new design formula is that it predicts berm recession much better than the existing methods, especially in case of more stable structures. 相似文献
18.
粤东-闽南沿岸海域上升流区软水母亚纲一新种和一新记录的记述 总被引：1，自引：0，他引：1
报道了2009年5月在粤东-闽南上升流区发现软水母亚纲（Leptomedusae Haeckel,1866）一新种,大腺触丝水母（Lovenella macrogonaLin,XuetHuang,sp.nov.）和我国海域一新记录,脆弱似杯水母[Phi-alella fragilis（Uchida,1938）].大腺触丝水母,新种的鉴别特征如下：伞半球形,外伞上有分散刺细胞,4个大的生殖腺,卵圆形,在辐管中部;4条主辐触手,触手球背部有块状黑色素,具有6~8对侧丝;4个大的间辐位缘疣,球形,具排泄乳突,背部有黑色素分布;24个平衡囊,每个平衡囊具1个平衡石. 相似文献
19.
新型多柱桁架式Spar平台水动力性能研究 总被引：4，自引：3，他引：4
Spar平台以其较大的水深适应范围,较好的运动性能和稳定性,在深海油气资源开采中得到广泛的使用。随着技术的进步,各种新型的Spar平台形式不断涌现,其各方面的性能也得到大量的研究。结合前几代Spar平台形式的特点,提出了一种新型的多柱桁架式Spar平台概念,希望通过桁架的使用,保持Spar良好的运动和受力总体性能,同时采用多柱式的硬舱结构,降低建造难度和成本。并对该Spar平台的水动力特性,载荷以及运动响应进行了数值建模计算,分析结果表明,其运动响应较小,水动力性能良好。 相似文献
20.
Observations of wintertime nutrient concentrations in surface waters are scarce in the temperate and subarctic North Atlantic Ocean. Three new methods of their estimation from spring or early summer observations are described and evaluated. The methods make use of a priori knowledge of the vertical distribution of oxygen saturation and empirical relationships between nutrient concentrations and oxygen saturation. A south–north increase in surface water winter nutrient concentration is observed. Winter nitrate concentrations range from very low levels of about 0.5 μmol dm−3 at 33°N to about 13.5 μmol dm−3 at 60°N. Previous estimates of winter nitrate concentrations have been overestimates by up to 50%. At the Biotrans Site (47°N, 20°W), a typical station in the temperate Northeast Atlantic, a mean winter nitrate concentration of 8 μmol dm−3 is estimated, compared to recently published values between 11 and 12.5 μmol dm−3. It is shown that most of the difference is due to a contribution of remineralised nitrate that had not been recognized in previous winter nutrient estimates. Mesoscale variation of wintertime nitrate concentrations at Biotrans are moderate (less than ±15% of the regional mean value of about 8 μmol dm−3). Interannual variation of the regional mean is small, too. In the available dataset, there was only 1 year with a significantly lower regional mean winter nitrate concentration (7 μmol dm−3), presumably due to restricted deep mixing during an atypically warm winter. The significance of winter nitrate estimates for the assessment of spring-bloom new production and the interpretation of bloom dynamics is evaluated. Applying estimates of wintertime nitrate concentrations of this study, it is found that pre-bloom new production (0.275 mol N m−2) at Biotrans almost equals spring-bloom new production (0.3 mol N m−2). Using previous estimates of wintertime nitrate yields unrealistically high estimates of pre-bloom new production (1.21–1.79 mol N m−2) which are inconsistent with observed levels of primary production and the seasonal development of biomass. 相似文献