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MHD triple diffusion due to the impulsive flow of micropolar nanofluids around a cone: Mangler’s transformations and ANN analyses 认领 引用
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作者 Z.Z.Rashed Sameh E.Ahmed 《Propulsion and Power Research》 SCIE CSCD 2025年第2期322-337,共16页
An implicit finite difference(FD)and artificial neural network(ANN)tech-niques are applied to study the triple diffusion and non-linear mixed convection flow around a vertical cone.The forced flow is due to an impulsi... An implicit finite difference(FD)and artificial neural network(ANN)tech-niques are applied to study the triple diffusion and non-linear mixed convection flow around a vertical cone.The forced flow is due to an impulsive motion of a micropolar nanofluid while the buoyancy-driven flow is obtained using the quadratic form of Boussinesq approx-imation.Two governing equations are introduced for the species concentrations;those include non-linear chemical reactions.It is focused on the cases of the weak concentration of microelements,opposing and assisting flow,and the roles of the magnetic field,viscous dissipation,and convective boundary conditions are examined.The solution methodology is based on Mangler’s transformations.At the same time,the effective ANN is used to predict some important physical quantities such as heat transfer rate against some key factors such as Biot number,Eckert number,and magnetic coefficient.Remarkably,the flow rate in the assisting flow is up to 0.95%higher than in the opposing flow.Across all cases,an increase in the vortex parameter(K Z 0:1-1:2)enhances fluid friction near the cone surface by 63.1%.These findings are particularly relevant for industrial applications involving heat and mass transfer in nanofluid systems,such as microreactors,biomedical engineering,and thermal energy storage. 展开更多
关键词 ANN FDM Micropolar nanofluids Non-linear chemical reaction Triple diffusion Impulsive motion Mangler’s transformations
Time-Reassigned Multisynchrosqueezing Generalized S Transform and Its Application in Frequency Decomposition Coherence 认领 引用
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作者 ZHANG Huixing WU Xuefeng HE Bingshou 《Journal of Ocean University of China》 SCIE CAS CSCD 2026年第3期919-934,共16页
Seismic attributes extracted from full frequency seismic data always show weak lateral continuity and unclear distribution when used for identifying faults.Frequency decomposition technology can improve the accuracy o... Seismic attributes extracted from full frequency seismic data always show weak lateral continuity and unclear distribution when used for identifying faults.Frequency decomposition technology can improve the accuracy of characterizing faults,while the accuracy depends on the time-frequency analysis(TFA)algorithms used.As a widely used TFA method,the generalized S-transform(GST)has the ability to perform multi-resolution analysis,although it still suffers from a problem of insufficient resolution.The time-reassigned synchrosqueezing theory has effectively addressed this problem.Based on this theory,we propose a new time-reassigned synchrosqueezing transform through deriving the group delay operator(GDO)of the GST.In order to achieve the best resolution,we use a parameter matching method to determine the optimal window parameters when calculating the GST spectrum.By performing multiple synchrosqueezing calculations on the obtained spectrum,we finally obtain the time-reassigned multisynchrosqueezing generalized S transform(TMGST).Synthetic signal tests show that TMGST not only exhibits significantly higher resolution than commonly used TFA methods,but also has high flexibility.We use TMGST to extract the frequency decomposition coherence attributes from the Kerry 3D seismic dataset,a publicly available marine seismic survey from New Zealand’s Taranaki Basin,for fault identification.The results show that the coherence anomalies at the fault locations are significantly enhanced and the faults are more clearly characterized by the proposed method in this paper. 展开更多
关键词 time-reassigned multisynchrosqueezing S transform parameter optimization frequency decomposition coherence fault identification
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Fe/S oxidation-coupled arsenic speciation transformation mediated by AMD enrichment culture under different pH conditions 认领 引用 被引量：2
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作者 Yu-hang Zhou Wei-xi Huang +5 位作者 Zhen-yuan Nie Hong-chang Liu Yue Liu Can Wang Jin-lan Xia Wen-sheng Shu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第3期681-700,共20页
Arsenic(As)speciation transformation in acid mine drainage(AMD)is comprehensively affected by biological and abiotic factors,such as microbially mediated Fe/S redox reactions and changes in environmental conditions(pH... Arsenic(As)speciation transformation in acid mine drainage(AMD)is comprehensively affected by biological and abiotic factors,such as microbially mediated Fe/S redox reactions and changes in environmental conditions(pH and oxidation-reduction potential).However,their combined impacts on arsenic speciation transformation remain poorly studied.Therefore,we explored arsenic transformation and immobilization during pyrite dissolution mediated by AMD enrichment culture under different acidic pH conditions.The results for incubation and mineralogical transformation of solid residues show that in the presence of AMD enrichment culture,pH 2.0,2.5,and 3.0 are more conducive to the formation of jarosites and ferric arsenate,which could immobilize high quantities of dissolved arsenic by adsorption and coprecipitation.The pH conditions significantly affect the initial adsorption of microbial cells to the minerals and the evolution of microbial community structure,further infuencing the biodissolution of pyrite and the release and oxidation process of Fe/S.The results of Fe/S/As speciation transformation of the solid residues show that the transformation of Fe,S,and As in solution is mainly regulated by pH and potential values,which imposed significantly different effects on the formation of secondary minerals and thus arsenic oxidation and immobilization.The above results indicated that arsenic transformation is closely related to the Fe/S oxidation associated with pyrite bio-oxidation,and this correlation is critically regulated by the pH conditions of the system. 展开更多
关键词 Acid mine drainage(AMD) pH conditions Fe/S/AS speciation transformation Microbial community structure
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Japan's Military Transformation and Sino-Japanese Military Relations 认领 引用
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作者 Yuan Yang is Deputy Director at the External Military Division of Military Academy of Sciences. 《Contemporary International Relations》 2003年第11期27-33,共7页
Military reform, which is led by the U. S. and sweeping its way to the rest of the world, has now become one of the hottest topics in inter- national military arena. Japan makes no exception. The reconstruction of its... Military reform, which is led by the U. S. and sweeping its way to the rest of the world, has now become one of the hottest topics in inter- national military arena. Japan makes no exception. The reconstruction of its military forces, which is still in progress, is concentrated on the following two aspects. One is the enlargement of the functions of the Self-Defense Forces (SDF). Participation in overseas operations is in- 展开更多
关键词 been on as in of Japan’s Military Transformation and Sino-JapaneSe Military Relations have SDF from for
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JIANGSU SHOWCASES THE CPC'S ROLE IN DRIVING INNOVATION AND ECONOMIC TRANSFORMATION 认领 引用
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作者 MA XIAOWEN 《Contemporary World》 2017年第4期33-35,共3页
The sound of Suzhou Pingtan,an art form which combines storytelling and ballad singing in the Suzhou dialect,swirled around a hall of the International Department of theCommunist Party of China’s Central Committee(ID... The sound of Suzhou Pingtan,an art form which combines storytelling and ballad singing in the Suzhou dialect,swirled around a hall of the International Department of theCommunist Party of China’s Central Committee(IDCPC)in Beijing on August 31.The singing enchanted the audience,including 400 visiting political party leaders and ambassadors of 展开更多
关键词 CPC JIANGSU SHOWCASES THE CPC’S ROLE IN DRIVING INNOVATION AND ECONOMIC TRANSFORMATION
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The change of the cationic peroxidase in the leaves at the fertile transformation period in Nongken 58s 认领 引用
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作者 HE Zhichang Dept of Plant Sci,College of Life Sci,Wuhan Univ,Wuhan 430072,China 《Chinese Rice Research Newsletter》 1997年第1期11-12,共2页
Nongken 58s is a type of photoperiod sensitivegenie male sterile rice which gives rice to malesterility when illuminated time is longer than13.75 h/d.The photoperiod sensitive stagesare from the differentiation of pri... Nongken 58s is a type of photoperiod sensitivegenie male sterile rice which gives rice to malesterility when illuminated time is longer than13.75 h/d.The photoperiod sensitive stagesare from the differentiation of primary branchprimordum(Ⅱ)in young ears to fullness ofcontents of the pollen(Ⅶ).The changes ofactivity and isoenzymes in cation peroxidase atph0toperiod sensitive stages and the relation-ship between this enzyme and feritility of rice 展开更多
关键词 The change of the cationic peroxidase in the leaves at the fertile transformation period in Nongken 58s
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Amplitude spectrum compensation and phase spectrum correction of seismic data based on the generalized S transform 认领 引用 被引量：14
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作者 周怀来 王峻 +3 位作者 王明春 沈铭成 张听锟 梁平 《Applied Geophysics》 SCIE CSCD 2014年第4期468-478,510,511,共11页
We propose a method for the compensation and phase correction of the amplitude spectrum based on the generalized S transform. The compensation of the amplitude spectrum within a reliable frequency range of the seismic... We propose a method for the compensation and phase correction of the amplitude spectrum based on the generalized S transform. The compensation of the amplitude spectrum within a reliable frequency range of the seismic record is performed in the S domain to restore the amplitude spectrum of reflection. We use spectral simulation methods to fit the time-dependent amplitude spectrum and compensate for the amplitude attenuation owing to absorption. We use phase scanning to select the time-, space-, and frequencydependent phases correction based on the parsimony criterion and eliminate the residual phase effect of the wavelet in the S domain. The method does not directly calculate the Q value; thus, it can be applied to the case of variable Q. The comparison of the theory model and field data verify that the proposed method can recover the amplitude spectrum of the strata reflectivity, while eliminating the effect of the residual phase of the wavelet. Thus, the wavelet approaches the zero-phase wavelet and, the seismic resolution is improved. 展开更多
关键词 generalized S transform amplitude spectra phase spectra seismic resolution phase correction
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Ground roll attenuation using a time-frequency dependent polarization filter based on the S transform 认领 引用 被引量：13
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作者 谭玉阳 何川 +1 位作者 王艳冬 赵忠 《Applied Geophysics》 SCIE CSCD 2013年第3期279-294,358,共16页
The ground roll and body wave usually show significant differences in arrival time, frequency content, and polarization characteristics, and conventional polarization filters that operate in either the time or frequen... The ground roll and body wave usually show significant differences in arrival time, frequency content, and polarization characteristics, and conventional polarization filters that operate in either the time or frequency domain cannot consider all these elements. Therefore, we have developed a time-frequency dependent polarization filter based on the S transform to attenuate the ground roll in seismic records. Our approach adopts the complex coefficients of the S transform of the multi-component seismic data to estimate the local polarization attributes and utilizes the estimated attributes to construct the filter function. In this study, we select the S transform to design this polarization filter because its scalable window length can ensure the same number of cycles of a Fourier sinusoid, thereby rendering more precise estimation of local polarization attributes. The results of applying our approach in synthetic and real data examples demonstrate that the proposed polarization filter can effectively attenuate the ground roll and successfully preserve the body wave. 展开更多
关键词 Ground roll S transform spectral matrix polarization attributes polarization filter
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Seismic data denoising based on mixed time-frequency methods 认领 引用 被引量：10
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作者 蔡涵鹏 贺振华 黄德济 《Applied Geophysics》 SCIE CSCD 2011年第4期319-327,371,共9页
Deconvolution denoising in the f-x domain has some defects when facing situations like complicated geology structure, coherent noise of steep dip angles, and uneven spatial sampling. To solve these problems, a new fil... Deconvolution denoising in the f-x domain has some defects when facing situations like complicated geology structure, coherent noise of steep dip angles, and uneven spatial sampling. To solve these problems, a new filtering method is proposed, which uses the generalized S transform which has good time-frequency concentration criterion to transform seismic data from the time-space to time-frequency-space domain （t-f-x）. Then in the t-f-x domain apply Empirical Mode Decomposition （EMD） on each frequency slice and clear the Intrinsic Mode Functions （IMFs） that noise dominates to suppress coherent and random noise. The model study shows that the high frequency component in the first IMF represents mainly noise, so clearing the first IMF can suppress noise. The EMD filtering method in the t-f-x domain after generalized S transform is equivalent to self-adaptive f-k filtering that depends on position, frequency, and truncation characteristics of high wave numbers. This filtering method takes local data time-frequency characteristic into consideration and is easy to perform. Compared with AR predictive filtering, the component that this method filters is highly localized and contains relatively fewer low wave numbers and the filter result does not show over-smoothing effects. Real data processing proves that the EMD filtering method in the t-f-x domain after generalized S transform can effectively suppress random and coherent noise of steep dips. 展开更多
关键词 Empirical Mode Decomposition generalized S transform coherent noise random noise noise suppression
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Improving the resolution of seismic traces based on the secondary time-frequency spectrum 认领 引用 被引量：16
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作者 Wang De-Ying Huang Jian.Ping +2 位作者 Kong Xue Li Zhen-Chun Wang Jiao 《Applied Geophysics》 SCIE CSCD 2017年第2期236-246,323,共11页
The resolution of seismic data is critical to seismic data processing and the subsequent interpretation of fine structures. In conventional resolution improvement methods, the seismic data is assumed stationary and th... The resolution of seismic data is critical to seismic data processing and the subsequent interpretation of fine structures. In conventional resolution improvement methods, the seismic data is assumed stationary and the noise level not changes with space, whereas the actual situation does not satisfy this assumption, so that results after resolution improvement processing is not up to the expected effect. To solve these problems, we propose a seismic resolution improvement method based on the secondary time-frequency spectrum. First, we propose the secondary time-frequency spectrum based on S transform （ST） and discuss the reflection coefficient sequence and time-dependent wavelet in the secondary time frequency spectrum. Second, using the secondary time frequency spectrum, we design a two- dimensional filter to extract the amplitude spectrum of the time-dependent wavelet. Then, we discuss the improvement of the resolution operator in noisy environments and propose a novel approach for determining the broad frequency range of the resolution operator in the time- fi＇equency-space domain. Finally, we apply the proposed method to synthetic and real data and compare the results of the traditional spectrum-modeling deconvolution and Q compensation method. The results suggest that the proposed method does not need to estimate the Q value and the resolution is not limited by the bandwidth of the source. Thus, the resolution of the seismic data is improved sufficiently based on the signal-to-noise ratio （SNR）. 展开更多
关键词 resolution S transform time-frequency spectrum time-variant wavelet spectrum-modeling deconvolution Q compensation
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Comparison of different techniques for time-frequency analysis of internal combustion engine vibration signals 认领 引用 被引量：4
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作者 Yang JIN Zhi-yong HAO Xu ZHENG 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2011年第7期519-531,共13页
In this study,we report an analysis of cylinder head vibration signals at a steady engine speed using short-time Fourier transform(STFT).Three popular time-frequency analysis techniques,i.e.,STFT,analytic wavelet tran... In this study,we report an analysis of cylinder head vibration signals at a steady engine speed using short-time Fourier transform(STFT).Three popular time-frequency analysis techniques,i.e.,STFT,analytic wavelet transform(AWT) and S transform(ST),have been examined.AWT and ST are often applied in engine signal analyses.In particular,an AWT expression in terms of the quality factor Q and an analytical relationship between ST and AWT have been derived.The time-frequency resolution of a Gaussian function windowed STFT was studied via numerical simulation.Based on the simulation,the empirical limits for the lowest distinguishable frequency as well as the time and frequency resolutions were determined.These can provide insights for window width selection,spectrogram interpretation and artifact identification.Gaussian function windowed STFTs were applied to some cylinder head vibration signals.The spectrograms of the same signals from ST and AWT were also determined for comparison.The results indicate that the uniform resolution feature of STFT is not necessarily a disadvantage for time-frequency analysis of vibration signals when the engine is in stationary state because it can more accurately localize the frequency components excited by transient excitations without much loss of time resolution. 展开更多
关键词 Short-time Fourier transform(sTFT) Gaussian window Time-frequency resolution limits Internal combustion(IC) engine Vibration signals Analytic wavelet transform(AWT) S transform(sT)
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Application of sparse S transform network with knowledge distillation in seismic attenuation delineation 认领 引用 被引量：2
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作者 Nai-Hao Liu Yu-Xin Zhang +3 位作者 Yang Yang Rong-Chang Liu Jing-Huai Gao Nan Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2024年第4期2345-2355,共11页
Time-frequency analysis is a successfully used tool for analyzing the local features of seismic data.However,it suffers from several inevitable limitations,such as the restricted time-frequency resolution,the difficul... Time-frequency analysis is a successfully used tool for analyzing the local features of seismic data.However,it suffers from several inevitable limitations,such as the restricted time-frequency resolution,the difficulty in selecting parameters,and the low computational efficiency.Inspired by deep learning,we suggest a deep learning-based workflow for seismic time-frequency analysis.The sparse S transform network(SSTNet)is first built to map the relationship between synthetic traces and sparse S transform spectra,which can be easily pre-trained by using synthetic traces and training labels.Next,we introduce knowledge distillation(KD)based transfer learning to re-train SSTNet by using a field data set without training labels,which is named the sparse S transform network with knowledge distillation(KD-SSTNet).In this way,we can effectively calculate the sparse time-frequency spectra of field data and avoid the use of field training labels.To test the availability of the suggested KD-SSTNet,we apply it to field data to estimate seismic attenuation for reservoir characterization and make detailed comparisons with the traditional time-frequency analysis methods. 展开更多
关键词 S transform Deep learning Knowledge distillation Transfer learning SeiSmic attenuation delineation
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High-frequency compensation for seismic data based on adaptive generalized S transform 认领 引用 被引量：2
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作者 Li Hui-Feng Wang Jin +1 位作者 Wei Zheng-Rong Yang Fei-Long 《Applied Geophysics》 SCIE CSCD 2020年第5期747-755,902,共9页
The low-pass fi ltering eff ect of the Earth results in the absorption and attenuation of the high-frequency components of seismic signals by the stratum during propagation.Hence,seismic data have low resolution.Consi... The low-pass fi ltering eff ect of the Earth results in the absorption and attenuation of the high-frequency components of seismic signals by the stratum during propagation.Hence,seismic data have low resolution.Considering the limitations of traditional high-frequency compensation methods,this paper presents a new method based on adaptive generalized S transform.This method is based on the study of frequency spectrum attenuation law of seismic signals,and the Gauss window function of adaptive generalized S transform is used to fi t the attenuation trend of seismic signals to seek the optimal Gauss window function.The amplitude spectrum compensation function constructed using the optimal Gauss window function is used to modify the time-frequency spectrum of the adaptive generalized S transform of seismic signals and reconstruct seismic signals to compensate for high-frequency attenuation.Practical data processing results show that the method can compensate for the high-frequency components that are absorbed and attenuated by the stratum,thereby eff ectively improving the resolution and quality of seismic data. 展开更多
关键词 seismic data time-frequency analysis adaptive generalized S transform high-frequency compensation
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Fractional S transform-Part 1:Theory 认领 引用 被引量：6
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作者 胥德平 郭科 《Applied Geophysics》 SCIE CSCD 2012年第1期73-79,116,共7页
The S transform, which is a time-frequency representation known for its local spectral phase properties in signal processing, uniquely combines elements of wavelet transforms and the short-time Fourier transform （STF... The S transform, which is a time-frequency representation known for its local spectral phase properties in signal processing, uniquely combines elements of wavelet transforms and the short-time Fourier transform （STFT）. The fractional Fourier transform is a tool for non-stationary signal analysis. In this paper, we define the concept of the fractional S transform （FRST） of a signal, based on the idea of the fractional Fourier transform （FRFT） and S transform （ST）, extend the S transform to the time-fractional frequency domain from the time- frequency domain to obtain the inverse transform, and study the FRST mathematical properties. The FRST, which has the advantages of FRFT and ST, can enhance the ST flexibility to process signals. Compared to the S transform, the FRST can effectively improve the signal time- frequency resolution capacity. Simulation results show that the proposed method is effective. 展开更多
关键词 fractional S transform fractional Fourier transform time-frequency analysis
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Application of S-transform threshold filtering in Anhui experiment airgun sounding data de-noising 认领 引用 被引量：1
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作者 Chenglong Zheng Xiaofeng Tian +2 位作者 Zhuoxin Yang Shuaijun Wang Zhenyu Fan 《Geodesy and Geodynamics》 2018年第4期320-327,共8页
As a relatively new method of processing non-stationary signal with high time-frequency resolution, S transform can be used to analyze the time-frequency characteristics of seismic signals. It has the following charac... As a relatively new method of processing non-stationary signal with high time-frequency resolution, S transform can be used to analyze the time-frequency characteristics of seismic signals. It has the following characteristics: its time-frequency resolution corresponding to the signal frequency, reversible inverse transform, basic wavelet that does not have to meet the permit conditions. We combined the threshold method, proposed the S-transform threshold filtering on the basis of S transform timefrequency filtering, and processed airgun seismic records from temporary stations in "Yangtze Program"(the Anhui experiment). Compared with the results of the bandpass filtering, the S transform threshold filtering can improve the signal to noise ratio(SNR) of seismic waves and provide effective help for first arrival pickup and accurate travel time. The first arrival wave seismic phase can be traced farther continuously, and the Pm seismic phase in the subsequent zone is also highlighted. 展开更多
关键词 S transform Time-frequency filtering Airgun data Threshold filtering De-noising
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Identification of voltage sag source location using S and TT transformed disturbance power 认领 引用 被引量：1
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作者 Hussain Shareef Azah Mohamed Ahmad Asrul Ibrahim 《Journal of Central South University》 SCIE EI CAS 2013年第1期83-97,共15页
An alternative method was introduced for voltage sag source location based on S and TT transformed disturbance powers. It is done to avoid the wrong and inconclusive detection of conventional disturbance power method ... An alternative method was introduced for voltage sag source location based on S and TT transformed disturbance powers. It is done to avoid the wrong and inconclusive detection of conventional disturbance power method proposed in the literature. Unlike in the case of the traditional method, the proposed method first transforms the recorded voltage and current during the sag event to some special features before calculating the new version of disturbance powers. The effectiveness of the proposed method has been verified through simulation and actual data from an industrial power system. The results show that the presented method can correctly detect the location of voltage sag source. 展开更多
关键词 power quality voltage sag S transform TT transform signal processing
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A Double-Ended Protection Principle for an LCC-VSC-MTDC System with Strong Anti-Interference Ability 认领 引用 被引量：1
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作者 ChuanjianWu Dahai Zhang Jinghan He 《Energy Engineering》 EI 2023年第2期299-316,共18页
The DC grid technology of multi-power supply and multi-drop-point power reception is an effective solution for large-scale renewable energy integration into the power grid.Line-commutated converter-Voltage source conv... The DC grid technology of multi-power supply and multi-drop-point power reception is an effective solution for large-scale renewable energy integration into the power grid.Line-commutated converter-Voltage source converter(LCC-VSC)power grids are one of the more important developmental directions of the future power grid that have occured in recent years.But the multi-terminal high voltage direct current system has the problems of inconsistent boundary characteristics,inconsistent control,and fault response characteristics,which puts higher requirements on the protection scheme.Thus,a completely new protection principle is proposed in this paper.Firstly,the fault characteristics of distributed capacitance current are analyzed.The reactive power calculated by the distribution parameters of different frequencies is different.Subsequently,the fault characteristics of DC reactive power are analyzed,and a DC reactive power extraction algorithm is proposed.The polarity of the multi-band DC reactive power is used to construct the protection scheme.Finally,the LCC-VSC power grid model verifies the correctness and superiority of the proposed protection scheme.The proposed scheme uses DC reactive power instead of fault current to solve the long delay problem caused by distributed capacitance.Compared with the prior art,the proposed solution is not affected by distributed capacitance and has a stronger anti-interference ability(600Ω+10 dB+1 ms). 展开更多
关键词 Hybrid DC transmission double-ended protection S transform Hilbert transform
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Activation of Uterine Smad3 Pathway Is Crucial for Embryo Implantation 认领 引用 被引量：3
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作者 Juan LI Xi-yuan DONG +4 位作者 Pei-wen YANG Shu-lin YANG Dan HU Han-wang ZHANG Cong SUI 《Current Medical Science》 SCIE CAS 2019年第6期997-1002,共6页
Embryo implantation is a complicated physiological process tightly regulated by multiple biological molecules including growth factors.Transforming growth factor-betas(TGF-βs)and their most specific signal transducti... Embryo implantation is a complicated physiological process tightly regulated by multiple biological molecules including growth factors.Transforming growth factor-betas(TGF-βs)and their most specific signal transduction factors,Smads,are expressed in the endometrium during the window of implantation.Recent researches indicated that Smad dependent TGF-β signaling may play an important role in the process of embryo implantation.In this study,we measured the expression of TGF-β1,TGF-β receptor type I(TpRI),Smad3 and p-Smad3 in the endometrium of mice and observed their elevation on day 4,5 and 6 of pseudopregnancy.Then we administrated a specific Smad3 inhibitor(Sis3)into the uterine cavity of mice on day 3 of pregnancy.The results showed a reduction in insulin-like growth factor-1(IGFBP-1)expression and the decreased number of implanted embryo after the administration.In addition,Sis3 was found to reduce the IGFBP-1 secretion in decidualized endometrial stromal cells.Taken all together,our findings demonstrated that TGF-β/Smad3 signaling is involved in the process of embryo implantation. 展开更多
关键词 transforming growth factor-betas(TGF-βs) Smad3 endometrial receptivity decidualization embryo implantation
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Medical Image Compression by Applying 3D DWT in PACS 认领 引用
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作者 Wang Si-xian Li Fei-peng +2 位作者 Zeng Fa-long Liao Meng-yang Li Hui 《Wuhan University Journal of Natural Sciences》 EI CAS 1999年第3期313-318,共6页
The process of image compression in a practical Picture Archiving and Communication System (PACS) was discussed with detail. To fully reduce the inter-slice correlation existing in the volumetric image sets generated ... The process of image compression in a practical Picture Archiving and Communication System (PACS) was discussed with detail. To fully reduce the inter-slice correlation existing in the volumetric image sets generated by CT and MR, 3D Discrete Wavelet Transformation (DWT) was introduced in our application. Instead of using a fixed quantizer of lossless low frequency and distinct loss of high frequency, an adaptive quantizer was devised taking MSE as the performance index. In the low frequency subband, DPCM was replaced withS+P transform to facilitate coding computation. Compared with JPEG or 2D DWT, our method is 20%–50% more efficient. Furthermore, preliminary tests showed that 33 dB may be the maximal distortion threshold for CT images. 展开更多
关键词 PACS 3D DWT S%PLUS%P transformation optimal bit allocation maximal distortion threshold
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Supplier Evaluation Model Based on Fuzzy Measures and Choquet Integral 认领 引用
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作者 武建章 张强 桑圣举 《Journal of Beijing Institute of Technology》 EI CAS 2010年第1期109-114,共6页
To identify interactions among evaluation criteria and describe their importance,a new identification method making use of a fuzzy measure is presented.The relative weight and interaction degree of every evaluation cr... To identify interactions among evaluation criteria and describe their importance,a new identification method making use of a fuzzy measure is presented.The relative weight and interaction degree of every evaluation criteria pair are obtained by using the diamond pairwise comparison method.Based on comparison results,the maximum eigenvector method of analytic hierarchy process （AHP）,the hierarchical clustering method,and the phi（s） transformation are utilized to generate values of the fuzzy measure for each subset of the evaluation criterion set.Overall evaluation on each supplier is aggregated by Choquet integral with respect to the fuzzy measure.Finally,an illustrative example demonstrates the practical feasibility and validity of the proposed method. 展开更多
关键词 fuzzy measure Choquet integral diamond pairwise comparison phi（s） transformation supplier evaluation
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