A method, which is based on the correlation measurement of intensity fluctuations in time-space-average rage domain, is invented to improve the visibility of ghost images obtained by thermal light. We demonstrate that...
详细信息
A method, which is based on the correlation measurement of intensity fluctuations in time-space-average rage domain, is invented to improve the visibility of ghost images obtained by thermal light. We demonstrate that the visibility of ghost images can be significantly enhanced using this method. A corresponding evaluation standard of the visibility of images and effects influencing the visibility of ghost images, such as the weight factor gamma and speckle frame numbers, are also discussed. (C) 2009 Elsevier B.V. All rights reserved.
BACKGROUND: Intestinal anastomosis is a major technical component of gastrointestinal procedures. We have developed a new procedure of colonic anastomosis with a degradable stent. This article evaluates this procedure...
详细信息
BACKGROUND: Intestinal anastomosis is a major technical component of gastrointestinal procedures. We have developed a new procedure of colonic anastomosis with a degradable stent. This article evaluates this procedure. METHODS: Forty pigs were assigned randomly to a stent group (n = 20) and a control group (n = 20). A colonic anastomosis with a degradable stent was performed in the stent group, and hand-sewn anastomosis was performed in the control group. Pigs of each group were divided evenly into 4 subgroups according to time of death (days 3, 7, and 14, and month 10 postoperatively) to evaluate the healing of anastomosis. RESULTS: All procedures were completed successfully. The surgical time of the stent group was significantly less than the control group. No complications occurred in either group. Bursting pressure of the stent group was significantly higher than the control group on postoperative days 3 and 7. No significant difference of hydroxyproline content or microvessel density was found between the 2 groups. CONCLUSIONS: The procedure of colonic anastomosis with a degradable stent is a simple, feasible, and safe procedure in this porcine model. (C) 2010 Elsevier Inc. All rights reserved.
In a fuzzy identity-based encryption (IBE) scheme, a user with the secret key for an identity ID is able to decrypt a ciphertext encrypted with another identity ID' if and only if ID and ID' are within a certa...
详细信息
In a fuzzy identity-based encryption (IBE) scheme, a user with the secret key for an identity ID is able to decrypt a ciphertext encrypted with another identity ID' if and only if ID and ID' are within a certain distance of each other as judged by some metric Fuzzy IBE also allows to encrypt a document to all users that have a certain set of attributes In 2005, Sahai and Waters first proposed the notion of fuzzy IBE and proved the security of their scheme under the selective-ID model. Currently, there is no fuzzy IBE scheme available that is fully CCA2 seem e in the standard model. In this paper, we propose a new fuzzy IBE scheme which achieves IND-FID-CCA2 security in the standard model with a tight reduction. Moreover, the size of public parameters is independent of the number of attributes associated with an identity.
A reagent, 1-(4-isopropyl) phenyl-3-methyl-5-pyrazolone (PPMP) has been synthesized and used for high-performance liquid chromatography/electrospray ionization mass spectrometry (HPLC/ESI-MS) determination of pre-colu...
详细信息
A reagent, 1-(4-isopropyl) phenyl-3-methyl-5-pyrazolone (PPMP) has been synthesized and used for high-performance liquid chromatography/electrospray ionization mass spectrometry (HPLC/ESI-MS) determination of pre-column labeled carbohydrates. Monosaccharides have been quantitatively converted into mono-PPMP-labeled derivatives with 28% aqueous ammonia as a catalyst at 80 degrees C during 70 min. Mono-PPMP derivatives have been demonstrated to exhibit better chemical stability than bis-PMP ones. PPMP-labeled mixture of twelve monosaccharides (galactosamine, glucosamine, galacturonic acid, glucuronic acid, galactose, glucose/N-acetylgalactosamine, N-acetylglucosamine, xylose, arabinose, mannose, fucose, and rhamnose) has been well separated by a reverse-phase HPLC and detected by on-line ESI-MS method under optimized conditions. The data on characteristic fragment ions of the 13 PPMP-labeled monosaccharides with MS2 data have been collected. The suggested method exhibits good linearity (correlation coefficients > 0.9975) between the peak areas and the concentration of monosaccharides in a broad concentration range and good reproducibility (RSD < 3.19%). The developed method has been successfully applied to analyze the monosaccharide composition of natural Spirulina polysaccharide SPPB-1. (C) 2010 Elsevier BM. All rights reserved.
The two-stage and two-phase anaerobic process (TSTP) composed of hydrolytic acidification reactor,first-order and second-order external circulation anaerobic reactors (EC) was taken to treat methanol wastewater. Test ...
详细信息
The two-stage and two-phase anaerobic process (TSTP) composed of hydrolytic acidification reactor,first-order and second-order external circulation anaerobic reactors (EC) was taken to treat methanol wastewater. Test results show that TSTP process is quick start-up in 51 d, and the maximum VFA of hydrolytic acidification reactor effluent reaches 876 mg/L. Under the condition of volume loading of 6.56 kgCOD/m3·d, COD removal rate of the first-order EC reactor is about 85%, and under the condition of volume loading of 1.02 kgCOD/m3·d, COD removal rate of the second-order EC reactor is about 50%. When the inflow COD of TSTP process is between 7000-11000 mg/L, its effluent COD is lower than 600 mg/L. In the biological conversion process of methanol into methane,the production of acetic acids as an intermediate product can be ignored and the direct production of methane from methanol is predominant.
This paper explores the use of cloud computing for remote sensing image *** main contribution of our work is to develop a remote sensing image processing platform based on cloud computing technology(OpenRS-Cloud).This...
详细信息
This paper explores the use of cloud computing for remote sensing image *** main contribution of our work is to develop a remote sensing image processing platform based on cloud computing technology(OpenRS-Cloud).This paper focuses on enabling methodical investigations into the development pattern,computational model,data management and service model exploring this novel distributed computing *** experimental INSAR processing flow is implemented to verify the efficiency and feasibility of OpenRS-Cloud *** results show that cloud computing is well suited for computationally-intensive and data-intensive remote sensing services.
Microstructures and mechanical properties of Mg-7Y-4Gd-1.5Zn-0.4Zr alloy in the as-cast, as-extruded and peak-aged conditions have been investigated by using optical microscope, scanning electron microscope, X-ray dif...
详细信息
Microstructures and mechanical properties of Mg-7Y-4Gd-1.5Zn-0.4Zr alloy in the as-cast, as-extruded and peak-aged conditions have been investigated by using optical microscope, scanning electron microscope, X-ray diffraction and transmission electron microscope. The results show that optimal mechanical properties of this alloy are obtained when it was aged at 220 degrees C. The values of the ultimate tensile strength and yield tensile strength are 418 and 320 MPa, respectively. The age hardening response decreases with increasing ageing temperature because the beta' phase gets coarse as ageing temperature increases. (C) 2009 Elsevier B.V. All rights reserved.
We study the effect of Gaussian white noise on erosion of safe basin in a simple model of power system whose safe basin is integral in the absence of noise. The stochastic Melnikov method is first applied to predict t...
详细信息
We study the effect of Gaussian white noise on erosion of safe basin in a simple model of power system whose safe basin is integral in the absence of noise. The stochastic Melnikov method is first applied to predict the onset of basin erosion when the noise excitation is present in system. And then the eroded basins are simulated according to the necessary restrictions for the system's parameters. It is found that for the noisy power system when the noise intensity sigma is greater than a threshold, basin erosion occurs and as sigma is further increased basin erosion is aggravated. These studies imply that random noise excitation can induce and enhance the basin erosion in the power system.
Carbon fibre reinforced carbon and silicon carbide dual matrix composites (C/C-SiC) show excellent tribological properties and are promising candidates for advanced friction materials. A pressure infiltration/carboniz...
详细信息
Carbon fibre reinforced carbon and silicon carbide dual matrix composites (C/C-SiC) show excellent tribological properties and are promising candidates for advanced friction materials. A pressure infiltration/carbonization combined with liquid silicon infiltration was developed for fabricating C/C-SiC composites. The carbon fabric preform was fabricated with the three-dimensional needling method. In the pressure infiltration process, the carbon fibre reinforced plastic was prepared by infiltration of the fabric preform with the furan resin. Then the carbon fibre reinforced plastic was carbonized which was pyrolysed to form a porous carbon/carbon composites. Finally, the porous carbon/carbon was infiltrated with molten silicon to obtain C/C-SiC composites. The composites exhibit excellent friction behavior, including a good stability of brake, and the average dynamic mu is 0.38 and static mu is 0.50, in combination with the linear wear rate of about 5.6 mu m cycle(-1). Moreover, the friction surface was covered with friction film which is about 10 mu m in thickness. These results show that the C/C-SiC brake composites are promising candidates for advanced brake and clutch systems. (C) 2010 Elsevier Masson SAS. All rights reserved.
作者：
Wang, FuminHuang, JingfengChen, LaZhejiang Univ
Inst Agr Remote Sensing & Informat Applicat Hangzhou 310029 Zhejiang Peoples R China Zhejiang Univ
Key Lab Environm Remediat & Ecol Hlth Minist Educ Hangzhou 310029 Zhejiang Peoples R China
Leaf area index (LAI) is an important structural variable for quantitative analysis of the energy and mass exchange characteristics of a terrestrial ecosystem. The objective of the research was to use the Scattering b...
详细信息
Leaf area index (LAI) is an important structural variable for quantitative analysis of the energy and mass exchange characteristics of a terrestrial ecosystem. The objective of the research was to use the Scattering by Arbitrarily Inclined Leaves (SAIL) model to develop a new vegetation index for estimating LAI based on the Ratio Vegetation Index (RVI) and Perpendicular Vegetation Index (PVI). In the study, RVIs and PVIs were derived from the SAIL-simulated reflectance, and several potential limitations of RVI and PVI in LAI estimation were identified. First, for a given LAI level, a dark soil background resulted in higher RVI values and overestimated LAI values. The reverse was true for light colored soils. On the contrary, the PVI tended to underestimate LAI for dark soil background and overestimate LAI for light soil background. The RVI behaves oppositely to PVI in LAI estimation for same soil background. Based on these results, a new vegetation index (RMPVI: RVI Multiplied by PVI Vegetation Index) was constructed, and the sensitivity of this index to LAI was then evaluated and the performance of RMPVI in LAI estimation was compared with those of other vegetation indices. The results show that the RMPVI can greatly minimize the soil background influences, and is more sensitive to LAI than other indices, especially when LAI is greater than 2. As for LAI estimation, RMPVI can yield highest R2 than other vegetation indices used in the study, with a root mean square error (RMSE) of 0.16, which shows RMVPI is an efficient index for LAI estimation.
暂无评论