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811.
812.
813.
西藏雅鲁藏布江中段构造混杂带特征及其构造意义 总被引:1,自引:0,他引:1
<正> 混杂体(Melange)是由板块俯冲过程中所导致的各种构造作用而混杂形成的一些杂乱地质体。它的主要特征是大小不同的各类岩块嵌在比较塑性,遭到强烈剪切作用和破碎作用的基质中,每一混杂体都包括基质(matrix)、外来岩块(exotic block)和原地岩块(native block)三部分。根据其中含有时代新于基质的外来岩块和基质的强烈剪切变形而区别于沉积成因的滑塌体(Olistostrome),又可根据基质的塑性形变和外来成分岩块的普遍出现而区别于一般构造产物(破碎岩、构造角砾岩等)。 相似文献
814.
M.?A.?IvanovEmail author L.?V.?Zasova L.?M.?Zeleny M.?V.?Gerasimov N.?I.?Ignatiev O.?I.?Korablev M.?Ya.?Marov 《Solar System Research》2017,51(2):87-103
The interplanetary mission, Venera-D, which is currently being planned, includes a lander. For a successful landing, it is necessary to estimate the frequency distributions of slopes of the Venusian surface at baselines that are comparable with the horizontal dimensions of lander (1–3 m). The available data on the topographic variations on Venus preclude estimates of the frequency of the short-wavelength slopes. In our study, we applied high-resolution digital terrain models (DTM) for specific areas in Iceland to estimate the slopes on Venus. The Iceland DTMs have 0.5 m spatial and 0.1 m vertical resolution. From the set of these DTMs, we have selected those that morphologically resemble typical landscapes on Venus such as tessera, shield, regional, lobate, and smooth plains. The mode of the frequency distribution of slopes on the model tessera terrain is within a 30°–40° range and a fraction of the surface has slopes <7°, which is considered as the upper safety limit. This is the primary interest. The frequency distribution of slopes on the model tessera is not changed significantly as the baseline is changed from 1 m to 3 m. The terrestrial surfaces that model shield and regional plains on Venus have a prominent slope distribution mode between 8°–20° and the fraction of the surfaces with slopes <7° is less than 30% on both 1 m and 3 m baselines. A narrow, left-shifted histogram characterizes the model smooth plains surfaces. The fraction of surfaces with slopes <7° is about 65–75% for the shorter baseline (1 m). At the longer baseline, the fraction of the shallow-sloped surfaces is increased and fraction of the steep slopes is decreased significantly. The fraction of surfaces with slopes <7° for the 3-m baseline is about 75–88% for the terrains that model both lobate and smooth plains. 相似文献
815.
M.?A.?IvanovEmail author L.?V.?Zasova M.?V.?Gerasimov O.?I.?Korablev M.?Ya.?Marov L.?M.?Zelenyi N.?I.?Ignat’ev A.?G.?Tuchin 《Solar System Research》2017,51(1):1-19
We discuss a change in the resurfacing regimes of Venus and probable ways of forming the terrain types that make up the surface of the planet. The interpretation of the nature of the terrain types and their morphologic features allows us to characterize their scientific priority and the risk of landing on their surface to be estimated. From the scientific point of view, two terrain types are of special interest and represent easily achievable targets: the lower unit of regional plains and the smooth plains associated with impact craters. Regional plains are probably a melting from the upper fertile mantle. The material of smooth plains of impact origin is a well-mixed and representative sample of the Venusian crust. The lower unit of regional plains is the most widespread one on the surface of Venus, and it occurs within the boundaries of all of the precalculated approach trajectories of the lander. Smooth plains of impact origin are crossed by the approach trajectories precalculated for 2018 and 2026. 相似文献
816.
Based on photographic and CCD observations with the Pulkovo 26-inch refractor, radial velocity measurements with the 1.5-m RTT-150 telescope (TUBITAK National Observatory, Turkey), and highly accurate observations published in the WDS catalog, we have obtained the orbits of ten wide visual double stars by the apparent motion parameter method. The orientation of the orbits in the Galactic coordinate system has been determined. For the outer pair of the multiple star HIP 12780 we have calculated a family of orbits with a minimum period P = 4634 yr. Two equivalent solutions with the same period have been obtained for the stars HIP 50 (P = 949 yr) and HIP 66195 (P = 3237 yr). We have unambiguously determined the orbits of six stars: HIP 12777 (P = 3327 yr), HIP 15058 (P = 420 yr), HIP 33287 (P = 1090 yr), HIP 48429 (P = 1066 yr), HIP 69751 (P = 957 yr), and HIP 73846 (P = 1348 yr). The orbit of HIP 55068 is orientated perpendicularly to the plane of the sky, P >1000 yr. The star HIP 48429 is suspected to have an invisible companion. 相似文献
817.
S. P. Smyshlyaev E. A. Mareev V. Ya. Galin 《Izvestiya Atmospheric and Oceanic Physics》2010,46(4):451-467
A chemistry-climate model of the lower and middle atmosphere has been used to estimate the sensitivity of the atmospheric
gas composition to the rate of thunderstorm production of nitrogen oxides at upper tropospheric and lower stratospheric altitudes.
The impact that nitrogen oxides produced by lightning have on the atmospheric gas composition is treated as a subgrid-scale
process and included in the model parametrically. The natural uncertainty in the global production rate of nitrogen oxides
in lightning flashes was specified within limits from 2 to 20 Tg N/year. Results of the model experiments have shown that,
due to the variability of thunderstorm-produced nitrogen oxides, their concentration in the upper troposphere and lower stratosphere
can vary by a factor of 2 or 3, which, given the influence of nitrogen oxides on ozone and other gases, creates the potential
for a strong perturbation of the atmospheric gas composition and thermal regime. Model calculations have shown the strong
sensitivity of ozone and the OH hydroxyl to the amount of lightning nitrogen oxides at different atmospheric altitudes. These
calculations demonstrate the importance of nitrogen oxides of thunderstorm origin for the balance of atmospheric odd ozone
and gases linked to it, such as ozone and hydroxyl radicals. Our results demonstrate that one important task is to raise the
accuracy of estimates of the rate of nitrogen oxide production by lightning discharges and to use physical parametrizations
that take into account the local lightning effects and feedbacks arising in this case rather than climatological data in models
of the gas composition and general circulation of the atmosphere. 相似文献
818.
Multiyear time series obtained by the continuous instrumental monitoring of the electrical activity (EA) of weakly electric
fish Gnathonemus leopoldianus and the motor activity (MA) of the freshwater catfish Hoplosternum thoracatum and the cockroach Blaberus craniifer are compared to the parameters of the lunisolar gravitational tide. These curves are observed to be very similar for a large
number of time intervals. However, a more detailed analysis shows this to be only a superficial resemblance caused by the
closeness of the periods of diurnal and semidiurnal rhythms of bioindicator activity (the dominant rhythms in EA and MA patterns)
and the periods of main gravitational tidal waves. It is concluded that the lunisolar gravitational tide has no significant
effect on animal behavior in our experiment. 相似文献
819.
Cd~(2+)对青蛤(Cyclina sinensis)的毒性及蓄积过程研究 总被引:2,自引:0,他引:2
利用水生动物急性毒性实验方法,在6个浓度下Cd2+对青蛤的急性毒性进行测定,经回归分析后,得到Cd2+对青蛤96h半致死浓度为20.09mg/L,安全浓度为0.201mg/L。分别对半致死浓度和安全浓度下Cd2+在青蛤体内不同组织的蓄积情况进行了分析。结果表明,在半致死浓度条件下,168h青蛤各组织Cd2+的含量依次为肌肉内脏团鳃;而在安全浓度下,其结果为内脏团鳃肌肉,内脏团对于Cd2+富集能力远高于肌肉。讨论了青蛤的养殖环境及产品检验等问题。 相似文献
820.
鳗弧菌(Vibrio anguillarum)侵染对青蛤(Cyclina sinensis)磷酸酶活性的影响 总被引:2,自引:1,他引:1
对500个成体青蛤分别用鳗弧菌和生理盐水注射,在感染后3h、6h、12h、24h和36h分别取不同处理组的肝胰脏、鳃和闭壳肌组织,测定上述样品的碱性磷酸酶(ALP)及酸性磷酸酶(ACP)活性,分析鳗弧菌对青蛤体内免疫相关酶活性的影响。结果表明,鳗弧菌感染组的ALP与ACP活性从高到低依次为肝胰脏鳃闭壳肌,其中青蛤肝胰脏和鳃组织中ALP和ACP活性均有显著升高的趋势,并且在12h时达到最高,与对照组差异显著(P0.05),随后呈现下降趋势。而青蛤闭壳肌组织中侵染组ALP和ACP活性与对照组之间没有显著差异(P0.05)。鳗弧菌对青蛤的磷酸酶活性影响较大,对其免疫防御系统有明显的刺激作用。 相似文献