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排序方式: 共有35条查询结果,搜索用时 31 毫秒
1.
Purdy W.E. Gaiser P.W. Poe G.A. Uliana E.A. Meissner T. Wentz F.J. 《Geoscience and Remote Sensing, IEEE Transactions on》2006,44(3):496-505
Geolocation and pointing accuracy analyses of the WindSat flight data are presented. The two topics were intertwined in the flight data analysis and will be addressed together. WindSat has no unusual geolocation requirements relative to other sensors, but its beam pointing knowledge accuracy is especially critical to support accurate polarimetric radiometry. Pointing accuracy was improved and verified using geolocation analysis in conjunction with scan bias analysis. Two methods were needed to properly identify and differentiate between data time tagging and pointing knowledge errors. Matchups comparing coastlines indicated in imagery data with their known geographic locations were used to identify geolocation errors. These coastline matchups showed possible pointing errors with ambiguities as to the true source of the errors. Scan bias analysis of U, the third Stokes parameter, and of vertical and horizontal polarizations provided measurement of pointing offsets resolving ambiguities in the coastline matchup analysis. Several geolocation and pointing bias sources were incrementally eliminated resulting in pointing knowledge and geolocation accuracy that met all design requirements. 相似文献
2.
Ahn TS Al-Kaysi RO Müller AM Wentz KM Bardeen CJ 《The Review of scientific instruments》2007,78(8):086105
A new method is presented for analyzing the effects of self-absorption on photoluminescence integrating sphere quantum yield measurements. Both the observed quantum yield and luminescence spectrum are used to determine the self-absorption probability, taking into account both the initial emission and subsequent absorption and reemission processes. The analysis is experimentally validated using the model system of the laser dye perylene red dispersed in a polymer film. This approach represents an improvement over previous methods that tend to overestimate the true quantum yield, especially in cases with high sample absorbance or quantum yield values. 相似文献
3.
An updated analysis of the ocean surface wind direction signal in passive microwave brightness temperatures 总被引:2,自引:0,他引:2
We analyze the wind direction signal for vertically (v) and horizontally (h) polarized microwave radiation at 37 GHz, 19 GHz, and 11 GHz; and an Earth incidence angle of 53/spl deg/. We use brightness temperatures from SSM/I and TMI and wind vectors from buoys and the QUIKSCAT scatterometer. The wind vectors are space and time collocated with the radiometer measurements. Water vapor, cloud water and sea surface temperature are obtained from independent measurements and are uncorrelated with the wind direction. We find a wind direction signal that is noticeably smaller at low and moderate wind speeds than a previous analysis had indicated. We attribute the discrepancy to errors in the atmospheric parameters that were present in the data set of the earlier study. We show that the polarization combination 2v-h is almost insensitive to atmospheric changes and agrees with the earlier results. The strength of our new signals agrees well with JPL aircraft radiometer measurements. It is significantly smaller than the prediction of the two-scale sea surface emission model for low and intermediate wind speeds. 相似文献
4.
Elizabeth A. Wentz David Nelson Atiqur Rahman William L. Stefanov Shoursaseni Sen Roy 《International journal of remote sensing》2013,34(15):4405-4427
This study presents the results of classifying land use/land cover for Delhi, India using an expert system approach. For this study Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data of 22 September 2003 were used. The research goals of this project are two‐fold. In one respect, the research goal is to report on the extent covered by urbanization using the classified image. Thirteen different land‐cover categories were identified with an 85.55% overall classification accuracy based on 256 random points for validation and 50 on the ground observations. Secondly, we report on our efforts to duplicate an expert system model previously developed for Phoenix Arizona as a generalized approach for urban land use classification. Results suggest that while some of the methodology could be duplicated, there are local factors (e.g. data availability and specific land features) that required the approach to be modified. 相似文献
5.
EY Adashi JA Rock D Guzick AC Wentz GS Jones HW Jones 《Canadian Metallurgical Quarterly》1981,36(3):320-325
Fertility following bilateral ovarian wedge resection (BOWR) was evaluated in a retrospective cohort study of 90 consecutive cases of the polycystic ovary syndrome. Post-BOWR follow-up was available for varying time spans of up to 10 years. BOWR resulted in the resumption of menstrual cyclicity in 91.1% (82/90) of the cases. However, within this ovulatory group, 26 patients were characterized by oligo-ovulation and a significantly reduced conception rate (29.2%), as compared with that of 56 normo-ovulatory counterparts (60.3%). Although the crude overall conception rate for this series was 47.8%, the overall cumulative probability of conception at the end of follow-up as determined by life table analysis was 73%. The likelihood of conception at any given point in time was estimated by a monthly fecundability rate of 1.34%. Our findings also indicate that the probability of post-BOWR conception was unaffected by age, race, ward status, or duration of infertility. In contrast, persistent post-BOWR oligo- or anovulation and the presence of concurrent tuboperitoneal disease were reaffirmed as the most important determinants of the likelihood of post-BOWR conception. A minimum incidence of 7.8% was documented for acquired post-BOWR pelvic disease. 相似文献
6.
Charles J. Moretti Kevin R. Henke Charles A. Wentz 《Particulate Science and Technology》1988,6(4):393-404
Characterization of baghouse fly ash produced from lignite in fluidized-bed combustion tests indicated that the presence of arsenic in the ash leachate was an environmental concern. The capacity of three chemical additives (lime, calcium sulfate, and nitric acid) to immobilize the arsenic in the fly ash was evaluated. Lime was judged to be the preferred means of arsenic immobilization because it required the lowest weight percent addition to significantly reduce the arsenic concentration in the leachate. Calcium arsenate solution chemistry and various arsenic immobilization mechanisms are also discussed. 相似文献
7.
Wentz Brian Pham Dung Feaser Erin Smith Dylan Smith James Wilson Allison 《Universal Access in the Information Society》2019,18(4):871-880
Universal Access in the Information Society - Digital access to banking and financial systems is no longer merely a way to augment physical transactions or experiences. It is now the primary way... 相似文献
8.
M Scholz M Deli U Wildf?rster K Wentz A Recknagel H Preuschoft A Harders 《Canadian Metallurgical Quarterly》1996,39(2):33-37
Alterations of the plasma factors of hemocoagulation produced by injection of norepinephrine (NE) at progressively increasing doses over 14 days (the total dose ran 35 mg/kg of body mass) were studied in three groups of rats, i.e., animals bred at the low altitude of 760 m in Bishkek (group I), animals in-adapted (group II) and adapted to high altitude of the Tuya-Ashu pass (3200 m, Group III). By the 7th day of NE injection group-I developed a moderate hypercoagulation which persisted till the end of experiment. In adapted animals the high altitude exposure initiated hypocoagulation shifts which then gave place to hypercoagulation ones due to elevated activity of the procoagulant component of homeostasis. Maximally pronounced hypercoagulation charges were recorded in in-adapted rats (group II) and interpreted as a stress-reaction to natural hypoxia augmented by the stress-agent (NE). High altitude revealed greater defense-adaptive potential of the homeostatic system manifested as enhancement of the anticoagulation blood activity, e.g., increased ability to inactivate thromboplastin and thrombin, and fibrinolysis. 相似文献
9.
K Siebertz E Hemeke W Baumann D Gr?nemeyer K Wentz 《Canadian Metallurgical Quarterly》1993,38(4):81-86
Invasive measurement of internal loads is either not possible at all, or is extremely difficult. A non-invasive method for use in the clinical setting might be the computer-aided simulation of a mechanical model. All the geometrical data required can be obtained, at a level of accuracy not previously attainable, with the aid of magnetic resonance imaging. 相似文献
10.
C. A. Pryde P. G. Kelleher M. Y. Hellman R. P. Wentz 《Polymer Engineering and Science》1982,22(6):370-375
A number of commercially available polycarbonates, including formulations made flame retardant by two different modifications, have been exposed to conditions producing moderately rapid hydrolysis. Hydrolysis rates were calculated from molecular weight data determined by gel permeation chromatography and, in some cases, from melt flow rate data. The rates calculated by the two methods are in good agreement. In general, the standard formulations containing minimal additive packages are the most hydrolytically stable. Although one relatively new flame retardant polycarbonate demonstrates generally good resistance to hydrolysis, most of the flame retardant formulations appear to be quite susceptible to hydrolytic degradation. For these materials, hydrolysis under conditions encountered in use could cause significant decreases in impact strength within a few years. 相似文献