A GPU based real-time GPS software receiver     

Thomas Hobiger  Tadahiro Gotoh  Jun Amagai  Yasuhiro Koyama  Tetsuro Kondo 《GPS Solutions》2010,14(2):207-216

Off-the-shelf graphics processing units provide low-cost massive parallel computing performance, which can be utilized for the implementation of a GPS software receiver. In order to realize a real-time capable system the crucial stages of the receiver should be optimized to suit the requirements of a parallel processor. Moreover, the receiver should be capable to provide wider correlation functions and provide easy access to the spectral domain of the signals. Thus, the most suitable correlation algorithm, which forms the core part of each receivers should be chosen and implemented on the graphics processor. Since the sampling rate of the received signal limits the real-time capabilities of the software radio it is necessary to determine an optimum value, considering that the precision of the observable varies with sampling bandwidth. We are going to discuss details and present our single frequency multi-channel implementation, which is capable of operating in real-time mode. Our implementation differs from other solutions by the wideness of the correlation function and allows simple handling of data in the spectral domain. Comparison with output from a commercial hardware receiver, which shares the antenna with the software radio, confirms the consistency and accuracy of our development.  相似文献   

Effect of temperature and food availability on reproductive investment of first-time spawning male Atlantic cod, Gadus morhua     

Yoneda  Michio; Wright  Peter J. 《ICES Journal of Marine Science》2005,62(7):1387-1393

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Sm and Gd isotopic shifts of Apollo 16 and 17 drill stem samples and their implications for regolith history     

Hiroshi Hidaka  Shigekazu Yoneda 《Geochimica et cosmochimica acta》2007,71(4):1074-1086

The isotopic compositions of Sm and Gd in lunar regolith samples from the Apollo 16 and 17 deep drill stems showed clear isotopic shifts in ¹⁵⁰Sm /¹⁴⁹Sm (ε = +124 to +191 for A-16, and +37 to +111 for A-17) and ¹⁵⁸Gd/¹⁵⁷Gd (ε = +107 to +169 for A-16, and +31 to +84 for A-17) corresponding to neutron fluences of (5.68-9.03) × 10¹⁶ n cm⁻² for A-16 and (1.85-5.04) × 10¹⁶ n cm⁻² for A-17. The depth profiles of neutron fluences suggest that the regoliths at both sites were due to incomplete mixing of three different slabs which experienced individual two-stage irradiation before and after deposition of the upper slabs. The variations in REE compositions provide chemical evidence for incompletely vertical mixing of regoliths especially at upper layers of the two sites. The thermal neutron energy index estimated from the combination of Sm and Gd isotopic shifts, defined as ε_Sm/ε_Gd, shows a small variation (0.61-0.64) in the A-16 core except for the surface layer. On the other hand, a large variation in ε_Sm/ε_Gd = 0.67 to 0.83 in the A-17 core may result from complicated history such as two-stage irradiation and incomplete mixing during the gardening processes. Isotopic enrichments of ¹⁵²Gd and ¹⁵⁴Gd correlated with Eu/Gd elemental abundances and neutron fluences were also observed in almost all of 15 samples, showing evidence of neutron-capture from ¹⁵¹Eu and ¹⁵³Eu, respectively.  相似文献   

Seismic structure and seismogenesis off Sanriku region, northeastern Japan   总被引：2，自引：0，他引：2  

Narumi Takahashi  Shuichi Kodaira  Tetsuro Tsuru  Jin-Oh Park  Yoshiyuki Kaneda  Kiyoshi Suyehiro  Hajimu Kinoshita  Shintaro Abe  Minoru Nishino  Ryota Hino 《Geophysical Journal International》2004,159(1):129-145

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Hydrogen isotope composition of deep-seated water   总被引：3，自引：0，他引：3  

Yoshimasu Kuroda  Tetsuro Suzuoki  Sadao Matsuo 《Contributions to Mineralogy and Petrology》1977,60(3):311-315

D/H ratios of phlogopites and amphiboles from rocks of possible mantle origin and also those of water from (glass?) inclusions in olivines of the olivine nodule and peridotites have been determined. The mantle water seems to have aδD value of —85±10‰ on the basis of results of inclusions in the nodule-olivine.  相似文献   

A preliminary study of D/H ratios of chlorites     

Yoshimasu Kuroda  Tetsuro Suzuoki  Sadao Matsuo  Haruo Shirozu 《Contributions to Mineralogy and Petrology》1976,57(2):223-225

Chemistry dependence of D of chlorites is inferred from data for natural chlorites. D of water equilibrated with those chlorites is estimated to be –2–8.  相似文献   

D/H ratios of the coexisting phlogopite and richterite from mica nodules and a peridotite in South African kimberlites     

Yoshimasu Kuroda  Tetsuro Suzuoki  Sadao Matsuo  Ken -ichiro Aoki 《Contributions to Mineralogy and Petrology》1975,52(4):315-318

The water content and D/H ratio of pairs of phlogopite and richterite in kimberlite samples were measured. The water contents of both minerals were lower than the formula content. On the basis of D/H ratios of the pair, phlogopite and richterite can not be regarded as a simple equilibrium product with respect to hydrogen isotope exchange. It seems impossible to estimate D/H ratio of the mantle water through D/H ratios of the hydrous silicate pairs.  相似文献   

Characterization of slip zone associated with the 1999 Taiwan Chi-Chi earthquake: X-ray CT image analyses and microstructural observations of the Taiwan Chelungpu fault     

Tetsuro Hirono  Masumi Sakaguchi  Kenshiro Otsuki  Hiroki Sone  Koichiro Fujimoto  Toshiaki Mishima  Weiren Lin  Wataru Tanikawa  Masaharu Tanimizu  Wonn Soh  En-Chao Yeh  Sheng-Rong Song 《Tectonophysics》2008,449(1-4):63-84

To characterize the fault-related rocks within the Chelungpu fault, we performed X-ray computed tomography (CT) image analyses and microstructural observations of Hole B core samples from the Taiwan Chelungpu-fault Drilling Project. We identified the slip zone associated with the 1999 Chi-Chi earthquake, within the black gouge zone in the shallowest major fault zone, by comparison with previous reports. The slip zone was characterized by low CT number, cataclastic (or ultracataclastic) texture, and high possibility to have experienced a mechanically fluidized state. Taking these characteristics and previous reports of frictional heating in the slip zone into consideration, we suggested that thermal pressurization was the most likely dynamic weakening mechanism during the earthquake.  相似文献   

Interelement relationships and age-related variation of trace element concentrations in liver of striped dolphins (Stenella coeruleoalba) from Japanese coastal waters     

Agusa T  Nomura K  Kunito T  Anan Y  Iwata H  Miyazaki N  Tatsukawa R  Tanabe S 《Marine pollution bulletin》2008,57(6-12):807-815

Concentrations of 19 trace elements (V, Cr, Mn, Fe, Co, Cu, Zn, Se, Rb, Sr, Mo, Ag, Cd, Sb, Cs, Ba, Tl, Hg, and Pb) were determined in the liver of the striped dolphins (Stenella coeruleoalba) collected around Japan during 1977-1982 to examine the sex difference, age dependence, and interrelationships among trace elements. Tissue distribution of trace elements was also investigated in one adult and one fetus specimens. Generally, concentrations of Se, Sr, Ag, Cd, Cs, Ba, Hg, and Pb were higher in the tissues of adult than those of fetus, whereas the opposite trend was observed for Cr and Tl. There were no significant sex differences in the trace element levels in the liver. Significant positive correlations between age (0-26.5 years) and hepatic concentrations were found for Ag, Se, Hg, V, Fe, Pb, and Sr, suggesting their age-dependent accumulation in the liver. In contrast, hepatic concentrations of Mn and Zn decreased with age. Significant positive relationships were observed between Se, and Hg, Ag, V, Fe, and Sr in the liver.  相似文献   

Interelement relationships and age-related variation of trace element concentrations in liver of striped dolphins (Stenella coeruleoalba) from Japanese coastal waters     

Tetsuro Agusa  Kumiko Nomura  Takashi Kunito  Yasumi Anan  Hisato Iwata  Nobuyuki Miyazaki  Ryo Tatsukawa  Shinsuke Tanabe   《Marine pollution bulletin》2008,57(6-12):807

Concentrations of 19 trace elements (V, Cr, Mn, Fe, Co, Cu, Zn, Se, Rb, Sr, Mo, Ag, Cd, Sb, Cs, Ba, Tl, Hg, and Pb) were determined in the liver of the striped dolphins (Stenella coeruleoalba) collected around Japan during 1977–1982 to examine the sex difference, age dependence, and interrelationships among trace elements. Tissue distribution of trace elements was also investigated in one adult and one fetus specimens. Generally, concentrations of Se, Sr, Ag, Cd, Cs, Ba, Hg, and Pb were higher in the tissues of adult than those of fetus, whereas the opposite trend was observed for Cr and Tl. There were no significant sex differences in the trace element levels in the liver. Significant positive correlations between age (0–26.5 years) and hepatic concentrations were found for Ag, Se, Hg, V, Fe, Pb, and Sr, suggesting their age-dependent accumulation in the liver. In contrast, hepatic concentrations of Mn and Zn decreased with age. Significant positive relationships were observed between Se, and Hg, Ag, V, Fe, and Sr in the liver.  相似文献