检索结果-南通市图书馆

Multi-Scale Dilated Convolution Network for SPECT-MPI Cardiovascular Disease Classification with Adaptive Denoising and Attenuation Correction

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2025年第1期142卷 299-327页

作者： A.robert Singh Suganya Athisayamani Gyanendra Prasad Joshi Bhanu Shrestha Department of Computational Intelligence SRM Institute of Science and TechnologyKattankulathur603203Tamil NaduIndia School of Computing Sastra Deemed to be UniversityThanjavur613401Tamil NaduIndia Department of Artificial Intelligence&Software Kangwon National UniversitySamcheok25913Republic of Korea Department of Information Convergence System Graduate School of Smart ConvergenceKwangwoon UniversitySeoul01897Republic of Korea

Myocardial perfusion imaging(MPI),which uses single-photon emission computed tomography(SPECT),is a well-known estimating tool for medical diagnosis,employing the classification of images to show situations in coronary artery disease(CAD).The automatic classification of SPECT images for different techniques has achieved near-optimal accuracy when using convolutional neural networks(CNNs).This paper uses a SPECT classification framework with three steps:1)Image denoising,2)Attenuation correction,and 3)Image *** denoising is done by a U-Net architecture that ensures effective image *** correction is implemented by a convolution neural network model that can remove the attenuation that affects the feature extraction process of ***,a novel multi-scale diluted convolution(MSDC)network is *** merges the features extracted in different scales and makes the model learn the features more *** scales of filters with size 3×3 are used to extract *** three steps are compared with state-of-the-art *** proposed denoising architecture ensures a high-quality image with the highest peak signal-to-noise ratio(PSNR)value of *** proposed classification method is compared with the five different CNN models,and the proposed method ensures better classification with an accuracy of 96%,precision of 87%,sensitivity of 87%,specificity of 89%,and f1-score of 87%.To demonstrate the importance of preprocessing,the classification model was analyzed without denoising and attenuation correction.

关键词： SPECT-MPI CAD MSDC denoising attenuation correction classification

Monitoring spatiotemporal soil moisture changes in the subsurface of forest sites using electrical resistivity tomography (ERT)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of forestry Research 2022年第5期33卷 1649-1662页

作者： Julian fäth Julius kunz Christof Kneisel Institute of Geography and Geology University of WürzburgAm Hubland97074 WürzburgGermany

The effects of drought on tree mortality at forest stands are not completely understood. for assessing their water supply, knowledge of the small-scale distribution of soil moisture as well as its temporal changes is a key issue in an era of climate change. However, traditional methods like taking soil samples or installing data loggers solely collect parameters of a single point or of a small soil volume. Electrical resistivity tomography (ERT) is a suitable method for monitoring soil moisture changes and has rarely been used in forests. This method was applied at two forest sites in Bavaria, Germany to obtain high-resolution data of temporal soil moisture variations. Geoelectrical measurements (2D and 3D) were conducted at both sites over several years (2015-2018/2020) and compared with soil moisture data (matric potential or volumetric water content) for the monitoring plots. The greatest variations in resistivity values that highly correlate with soil moisture data were found in the main rooting zone. Using the ERT data, temporal trends could be tracked in several dimensions, such as the interannual increase in the depth of influence from drought events and their duration, as well as rising resistivity values going along with decreasing soil moisture. The results reveal that resistivity changes are a good proxy for seasonal and interannual soil moisture variations. Therefore, 2D- and 3D-ERT are recommended as comparatively non-laborious methods for small-spatial scale monitoring of soil moisture changes in the main rooting zone and the underlying subsurface of forested sites. Higher spatial and temporal resolution allows a better understanding of the water supply for trees, especially in times of drought.

关键词： Geoelectrical monitoring forest ecology Hydrology Soil water content

Metal free Polymer/Graphite Electrode-ferricyanides Catholyte System for MfC with High Performance

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2020年第3期22卷 9-18页

作者： Jiang Bolong Ulrich kunz Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao 266000 Clausthal University of Technology Institute of Chemical and Electrochemical Process EngineeringGermany

A Microbial fuel cell(MfC)with metal free polymer/graphite electrodes(150 mm×150 mm)was *** electrodes with flowing channels,which were different in roughness,were *** additional catalyst was coated on the electrode,therefore the MfC was cheaper and possessed good durability with high *** effect of roughness,K3fe(CN)6 concentration and sprayed air on the performance of the constructed MfC was *** showed that the roughness of electrode can significantly affect the performance of *** power density of MfC increased by 1.56 times owing to the arithmetic mean roughness which has increased by 1.41 *** an increasing K3fe(CN)6 concentration,the performance of MfC also *** MfC with K3fe(CN)6 only(30 mM)showed the highest power density of 1260 mW/m2,which is by 21.4 times and 1.3 times higher than those of MfCs with spraying air only(59 mW/m2)and with K3fe(CN)6+air(1005 mW/m2),*** showed that the appropriate concentration of K3fe(CN)6 can significantly improve the power density,while the air has a negative effect when it is sprayed onto K3fe(CN)6 catholyte.A coulombic efficiency of 34.2%and an energy efficiency of 13.3%with a COD degradation rate of 73.5%were achieved with MfC using K3fe(CN)6 *** overpotentials of MfC were also *** can be seen that both theηohmic andηconcentration were very low as compared to theηactivation,and theηconcentration can be ignored because its effect was less than 3 *** theoretical calculation suggested that with an increasing conversion rate of K3fe(CN)6,the cathode potential decreased and reached 0.31 V at a conversion rate of *** the anode behaves differently for constant pH and changeable pH as the reaction progresses,which reveals that the buffer solution and removal of protons play an important role in maintaining the anode potential.

关键词： microbial fuel cell wastewater treatment potassium ferricyanide air power production electrochemical performance metal free polymer/graphite electrode

Anosov and expanding attractors

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2020年第9期63卷 1929-1934页

作者： robert f.Williams Department of Mathematics University of Texas at AustinAustinTX 78705USA Institute for Advanced Study PrincetonNJ 08540USA

An earlier conjecture is settled with an immersion of a 2-dimensional branched *** obstructions in linear algebra and tiling theory are studied rst.

关键词： Anosov expanding attractor Cantor set ber bundle

Predicting global landslide spatiotemporal distribution:Integrating landslide susceptibility zoning techniques and real-time satellite rainfall estimates

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2008年第3期23卷 249-257页

作者： robert f. ADLER Senior Research Scientist Code 613.1 Laboratory for Atmospheres NASA/Goddard Space Flight Center Greenbelt MD 20771 U. S. ADr.

Landslides triggered by rainfall can possibly be foreseen in real time by jointly using rainfall intensity-duration thresholds and information related to land surface susceptibility. However, no system exists at either a national or a global scale to monitor or detect rainfall conditions that may trigger landslides due to the lack of sufficient ground-based observing network in many parts of the world. Recent advances in satellite remote sensing technology and increasing availability of high-resolution geospatial products around the globe have provided an unprecedented opportunity for such a study. In this paper, a framework for developing a preliminary real-time prediction system to identify where rainfall-triggered landslides will occur is proposed by combining two necessary components: surface landslide susceptibility and a real-time space-based rainfall analysis system (http://***). first, a global landslide susceptibility map is derived from a combination of semi-static global surface characteristics (digital elevation topography, slope, soil types, soil texture, land cover classification, etc.) using a GIS weighted linear combination approach. Second, an adjusted empirical relationship between rainfall intensity-duration and landslide occurrence is used to assess landslide hazards at areas with high susceptibility. A major outcome of this work is the availability for the first time of a global assessment of landslide hazards, which is only possible because of the utilization of global satellite remote sensing products. This preliminary system can be updated continuously using the new satellite remote sensing products. This proposed system, if pursued through wide interdisciplinary efforts as recommended herein, bears the promise to grow many local landslide hazard analyses into a global decision-making support system for landslide disaster preparedness and mitigation activities across the world.

关键词： Landslide Natural disasters Satellite remote sensing Real-time precipitation analysis Landslide susceptibility

Desingularized boundary integral equations and their applications in wave dynamics and wave-body interaction problems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2016年第1期1卷 11-29页

作者： Yusong Cao robert f.Beck C-Z Marine Technology LLCHoustonTXUSA Department of Naval Architecture and Marine Engineering The University of MichiganAnn ArborMIUSA

Over the past 30 years or so,desingularized boundary integral equations(DBIEs)have been used to study water wave dynamics and body motion *** the potential flow modeling,unlike conventional boundary integral methods,a DBIE separates the integration surface and the control(collocation)surface,resulting in a BIE with non-singular *** desingularization allows simpler and faster numerical evaluation of the boundary integrals,and consequently faster numerical *** this paper,derivations of different forms of DBIEs are given and the fundamental aspects and advantages of the DBIEs are reviewed and *** examples of applications of DBIEs in wave dynamics and body motion dynamics are given and the outlook of future development of the desingularized methods is discussed.

关键词： Desingularized boundary integral equations Potential flows Wave dynamics Wave-body interactions.

Current taxane formulations and emerging cabazitaxel delivery systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第10期11卷 5193-5218页

作者： Boyang Sun robert M. Straubinger Jonathan f. Lovell Department of Biomedical Engineering University at Buffalo State University of New York Buffalo NY 14260 USA Department of Chemical and Biological Engineering University at Buffalo State University of New York Buffalo NY 14260 USA Department of Pharmaceutical Sciences University at Buffalo State University of New York Buffalo NY 14214 USA

Cabazitaxel is a second-generation taxane with promising anti-tumor activity and is approved for treating hormone-refractory metastatic prostate cancer previously treated with docetaxel. Although first-generation taxanes （i.e. paclitaxel and docetaxel） have sparked broad interest in a variety of drug delivery vehicles, fewer have yet been developed for cabazitaxel. This review summarizes several clinical-stage approaches for taxane formulation and recent efforts to develop novel cabazitaxel delivery systems.

关键词： cabazitaxel Jevtana taxanes drug delivery systems nanocarriers

fluidization behavior of graphitized glassy particles in a fluidized carbon bed cooling process for investment casting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2022年第6期20卷 32-38页

作者： Paul Git Matthias Hofmeister robert f.Singer Carolin Körner Chair of Materials Science and Engineering for Metals(WTM) Friedrich-Alexander UniversitätErlangen-Nürnberg(FAU)Martensstr.591058 ErlangenGermany

fluidized Carbon Bed Cooling(fCBC)is an innovative investment casting process for directional solidification of superalloy *** takes advantage of a fluidized bed with a base of small glassy carbon beads for cooling and other low-density particles that form an insulating layer by floating to the bed *** so-called“Dynamic Baffle”protects the fluidized bed from the direct heat input from the high-temperature heating zone and provides the basis for an improved bed *** prerequisites for a stable casting process are stable fluidization conditions where neither collapse of the bed nor particle blow out at excessive bubble formation *** work aimed to investigate the fluidization behavior of spherical carbon bed material in argon and air at temperatures between 20 to 350℃.Systematic studies at reduced pressures using the fCBC prototype device were performed to understand the stable fluidization conditions at all stages of the investment casting *** particle shape factor and size distribution characterization and the measurement of the powder’s minimum fluidization velocity and bed voidage show that this material can be fully utilized as a cooling and buoyancy medium during the fCBC process.

关键词： Gas-solid fluidization Glassy carbon Reduced pressure Increased temperature fluidized carbon bed

Microstructural development and mechanical properties of drop tube atomized Al-2.85 wt%fe

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第9期104卷 41-51页

作者： Mehmet R.Abul robert f.Cochrane Andrew M.Mullis School of Chemical&Process Engineering University of LeedsLeeds LS29JTUK

Al-2.85 wt%fe alloy has been subjected to non-equilibrium container-less solidification using a 6.5 m drop *** samples were collected and sieved into 7 sizes fractions ranging from 850μm to 53μm,with the estimated cooling rates being 150 to 11000 K s^(-1)*** analysis was employed on all droplet size fractions for identification and evolution of the phases,showing that Al,Al_(6)fe and Al_(13)fe_(4)were formed for all sizes while Al_(5)fe_(2)was observed only in droplets≤150μm in *** evaluation was conducted by using SEM and optical microscopy,showing that droplet larger than 300μm in diameter exhibited distinct morphologies;microcellular,dendriticα-Al with inter-dendritic Al_(13)fe_(4)eutectic and an AI-Al_(6)fe eutectic *** increasing cooling rate,the Al-Al_(6)fe region *** analysis reveals that increasing the cooling rate increased the dissolved fe content inα-Al from 0.37 wt%fe to 1.105 wt%fe,and correspondingly the eutectic fraction decreased from 49.7 vol.%to 26.7 vol.%.Measurement of the lamellar spacing allowed the eutectic growth velocity and interfacial undercooling to be calculated,wherein the Al-rich boundary of the eutectic coupled zone could be *** shows a coupled zone skewed significantly towards the intermetallic side of the *** order to understand the effect of non-equilibrium the solidification on the mechanical properties micro hardness of the droplets was *** micro-hardness has risen from 55.3 HV_(0.01)to 66.5 HV_(0.01)for≥850μm and≤75μm droplets,respectively.

关键词： Al-fe alloys Container-less solidification Microstructure TEM Micro-hardness