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1.
The South Pole-Aitken basin region,Moon: GIS-based geologic investigation using Kaguya elemental information 总被引:1,自引:0,他引:1
Kyeong Ja Kim James M. Dohm Jean-Pierre Williams Javier Ruiz Trent M. Hare Nobuyuki Hasebe Yuzuru Karouji Shingo Kobayashi Makoto Hareyama Eido Shibamura Masanori Kobayashi Claude d’Uston Olivier Gasnault Olivier Forni Sylvestre Maurice 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2012
Using Geographic Information Systems (GIS), we performed comparative analysis among stratigraphic information and the Kaguya (SELENE) GRS data of the ∼2500-km-diameter South Pole-Aitken (SPA) basin and its surroundings. Results indicate that the surface rock materials (including ancient crater materials, mare basalts, and possible SPA impact melt) are average to slightly elevated in K and Th with respect to the rest of the Moon. Also, this study demonstrates that K and Th have not significantly changed since the formation of SPA. The elemental signatures of the impact basin of Fe, Ti, Si, O through time include evidence for resurfacing by ejecta materials and late-stage volcanism. The oldest surfaces of SPA are found to be oxygen-depleted during the heavy bombardment period relative to later stages of geologic development, followed by both an increase in silicon and oxygen, possibly due to ejecta sourced from outside of SPA, and subsequent modification due to mare basaltic volcanism, which increased iron and titanium within SPA. The influence of the distinct geologic history of SPA and surroundings on the mineralogic and elemental abundances is evident as shown in our investigation. 相似文献
2.
庄河、光明山陨石的岩石矿物学研究 总被引:3,自引:0,他引:3
庄河陨石和光明山陨石是两个降落于同一地区的H5型普通球粒陨石.根据两辉石温度计求出这两个陨石的平衡温度< 500℃;根据镍纹石的带宽与组成关系,获得光明山陨石在其母体中的冷却速率约为 10-10℃/Ma,而庄河陨石中普遍出现均一的四方镍纹石表明其冷却速率更低.光明山陨石的冲击变质特征以硅酸盐颗粒破碎为主,其冲击相为S1;庄河陨石中硅酸盐矿物具明显的波状消光,并存在细小的冲击熔融脉,其冲击相划分为S2. 相似文献
3.
Robert Shiurba Tatsuo Hirabayashi Shin Kiyokawa Akimasa Fukui Yuko Miyanaga Issey Kojima Makoto Asashima 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1999,23(12):2041
In most ectotherms, environmental temperature has differential effects on growth and differentiation. For example, amphibian size at maturity decreases with increasing temperature. To address how radiant heat in the form of far-infrared radiation (FIR) may affect development of the aquatic ectotherm Xenopus laevis, we continuously irradiated swimming larvae as they developed into young adults. Here we report evidence that FIR promotes growth of these organisms in an aqueous environment. 相似文献
4.
Chikako Takahashi Makoto Suzuki Chihiro Mitsuda Satoshi Ochiai Naohiro Manago Hiroo Hayashi Yoshitaka Iwata Koji Imai Takuki Sano Masahiro Takayanagi Masato Shiotani 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
We estimate the capability of ozone (O3) retrieval with the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) instrument attached to the Exposed Facility of the Japanese Experiment Module (JEM) on the International Space Station (ISS). SMILES carries a 4-K mechanical refrigerator to cool superconducting devices in space. Since SMILES has high sensitivity thanks to the superconducting receiver, it is expected that SMILES has ability to retrieve O3 profiles more precisely than the previous millimeter–submillimeter limb measurements from satellites. 相似文献
5.
Manabu Sugimoto Makoto Ishii Izumi C. Mori Shagimardanova Elena Oleg A. Gusev Makoto Kihara Takehiro Hoki Vladimir N. Sychev Margarita A. Levinskikh Natalia D. Novikova Anatoly I. Grigoriev 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
Barley seeds were exposed to outer space for 13 months in a vented metal container without a climate control system to assess the risk of physiological and genetic mutation during long-term storage in space. The space-stored seeds (S0 generation), with an 82% germination rate in 50 seeds, lost about 20% of their weight after the exposure. The germinated seeds showed normal growth, heading, and ripening. The harvested seeds (S1 generation) also germinated and reproduced (S2 generation) as did the ground-stored seeds. The culm length, ear length, number of seed, grain weight, and fertility of the plants from the space-stored seeds were not significantly different from those of the ground-stored seeds in each of the S0 and S1 generation. Furthermore, the S1 and S2 space-stored seeds respectively showed similar β-glucan content to those of the ground-stored seeds. Amplified fragment length polymorphism analysis with 16 primer combinations showed no specific fragment that appears or disappears significantly in the DNA isolated from the barley grown from the space-stored seeds. Though these data are derived from nine S0 space-stored seeds in a single exposure experiment, the results demonstrate the preservation of barley seeds in outer space for 13 months without phenotypic or genotypic changes and with healthy and vigorous growth in space. 相似文献
6.
3D-Computaional Mesh Generation around a Propeller by Elliptic Differential Equation System 下载免费PDF全文
In this paper, an analytic method is applied for the generation of 3D mesh system in order for Navier-Stokes equations around ATP (Propfan). One of the advantages of this method is that mesh lines have strong differentiability. The differential equation used is Poisson type and the right hand side is called control function, and this is able to control the degree of mesh line clustering. Here, the form of control function was contrived to cluster near the solid surfaces. By this method, several mesh lines are laid in the boundary layer above the blade surfaces. 相似文献
7.
Junko Kitamoto Akimasa Fukui Makoto Asashima 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2005,35(9):1654-1661
Here, we report changes gene expression and morphology of the renal epithelial cell line, A6, which was derived from Xenopus laevis adult kidney that had been induced by long-term culturing with a three-dimensional clinostat. An oligo microarray analysis on the A6 cells showed that mRNA levels for 52 out of 8091 genes were significantly altered in response to clinorotation. On day 5, there was no dramatic change in expression level, but by day 8 and day 10, either upregulation or downregulation of gene expression became evident. By day 15, the expression levels of 18 out of 52 genes had returned to the original levels, while the remaining 34 genes maintained the altered levels of expression. Quantitative analyses of gene expression by real-time PCR confirmed that changes in the mRNA levels of selected genes were found only under clinorotation and not under hypergravity (7 g) or ground control. Morphological changes including loss of dome-like structures and disorganization of both E-cadherin adherence junctions and cortical actin were also observed after 10 days of culturing with clinorotation. These results revealed that the expression of selected genes was altered specifically in A6 cells cultured under clinorotation. 相似文献
8.
M L Wiederhold M Yamashita K Larsen M Asashima 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1994,14(8):327-330
Pre-mated adult female newts and fertilized eggs will be flown on the International Microgravity Laboratory-2 flight, in 1994. One objective of the flight will be to observe the influence of microgravity on the development of the gravity-sensing organs in the inner ear. These organs contain sensory hair cells covered by a layer of dense stones (otoconia). Gravity and linear acceleration exert forces on these masses, leading to excitation of the nerve fibers innervating the hair cells. If the production of the otoliths is regulated to reach an optimal weight, their development might be abnormal in microgravity. Ground-based control experiments are reported describing the developmental sequence in which both the otoliths and their associated sensory epithelium and the semicircular canals appear and develop. Three-dimensional reconstruction of serial sections through the otic vesicle of newt embryos at stages 31 through 58 demonstrate the first appearance, relative position and growth of the otoliths. Reports of experiments in which fertilized frog eggs were flown on a Russian Cosmos mission conclude that the utricular otolith is increased in volume, whereas the saccular otolith maintains normal size, suggesting that at least in the utricle, the weight of the otolith might be regulated. 相似文献
9.
This article analyses the rapid economic advancement of the Pacific Basin area, and discusses its future potential. Common efforts in space utilization can integrate the area, and overcome the wide diversity of political, economic and social structures. Aspects of communications, space remote sensing and space-based materials processing are examined and forecasts are made for the future role of the Pacific Basin in these areas. A populated Orbital Space City will be necessary to further space utilization. To support future activities in space, a Pacific Spaceport and a Pacific Space Centre are proposed, which would lead to the development of several ‘New Industrialized Areas’ in the age of the Solar Power Satellite. Estimates are made of the amount of electricity which will be required. 相似文献
10.
Koji Imai Makoto Suzuki Chikako Takahashi 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2010
We present a calculation of the accuracy and speed of the Voigt function of various algorithms (Armstrong (1967), Hui et al. (1978), Humlicek (1982) and improved version of Kuntz (1997) developed in this study) for making the faster and higher accuracy forward model required for the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) Level 2 (L2) data processing system. 相似文献