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Exploring the effect of cooling rate on non-isothermal crystallization of copolymer polypropylene by fast scanning calorimetry

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China Foundry 2024年第4期21卷 379-386页

作者： Yang Liao ye-yuan hu Kosuke Ikeda Ryoji Okabe Rui-fen Wu Ryota Ozaki Qing-yan Xu Key Laboratory for Advanced Materials Processing Technology School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Composite Laboratory Research&Innovation Center Mitsubishi Heavy Industries Ltd.Nagasaki 8510392Japan

Polypropylene is commonly used as a binder for ceramic injection molding,and rapid cooling is often encountered during ***,the crystallization behavior of polypropylene shows a strong dependence on cooling rate due to its semi-crystalline ***,the influence of cooling rate on the quality of final product cannot be *** this study,the fast differential scanning calorimetry(FSC)test was performed to study the influence of cooling rate on the non-isothermal crystallization behavior and non-isothermal crystallization kinetics of a copolymer polypropylene(PP BC03B).The results show that the crystallization temperatures and crystallinity decrease as the cooling rate *** addition,two exothermic peaks occur when cooling rate ranges from 30 to 300 K·s^(-1),indicating the formation of another crystal ***,Ozawa and Mo equations were used to explore the non-isothermal crystallization kinetics,and it can be concluded that the Mo method is suitable for this study.

关键词： cooling rate crystallization temperature crystallinity non-isothermal crystallization kinetics FSC copolymer polypropylene

供应链网络关系与商业信用供给——基于结构洞的视角

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当代财经 2024年第10期 73-85页

作者：袁业虎吴端端江西财经大学会计学院江西南昌330013

供应链网络是企业的重要社会网络,对促进供应链整体协同发展具有重要的作用。以2012—2022年我国A股上市企业为研究样本,从结构洞的视角探讨企业供应链网络关系对商业信用供给的影响及其作用机制。研究结果发现,具有丰富供应链网络结构... 详细信息

供应链网络是企业的重要社会网络,对促进供应链整体协同发展具有重要的作用。以2012—2022年我国A股上市企业为研究样本,从结构洞的视角探讨企业供应链网络关系对商业信用供给的影响及其作用机制。研究结果发现,具有丰富供应链网络结构洞的企业能显著提高商业信用供给,并优化商业信用供给结构。这是因为,企业占据供应链网络结构洞的位置,能通过缓解融资约束以提升商业信用的供给能力、增强企业风险承担能力以增强供给意愿,从而增加商业信用供给。在经济政策不确定性较低和市场化进程较高地区的企业、供应链稳定性较好和供应链地理距离较近的企业、非国有企业和成长期企业中,占据丰富的供应链网络结构洞位置对商业信用供给的影响更为显著。为此,企业应重视其所嵌入的供应链网络关系,制定合理的商业信用供给决策,构建合作共赢的供应链系统,推动供应链协同发展。

关键词：供应链网络结构洞商业信用供给商业信用结构

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On establishment of novel constitutive model for directionally solidified nickel-based superalloys utilizing machine learning methods

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中国铸造:英文版 2023年第5期20卷 365-375页

作者： Jia-yan Sun Rong Yin ye-yuan hu Yun-xiang Tan Qing-yan Xu Key Laboratory for Advanced Materials Processing Technology(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Xiaomi AI Lab Beijing100102China

To enhance the accuracy of mechanical simulation in the directional solidification process of turbine blades for heavy-duty gas turbines,a new constitutive model that employs machine learning methods was *** model incorporates incremental learning and transfer learning,thus improves the predictive accuracy and generalization *** account for the anisotropy of the directionally solidified alloy,a deformation direction parameter is added to the model,enabling prediction of the stress-strain relationship of the alloy under different deformation *** predictive capabilities of both models are evaluated using correlation coefficient(R),average relative error(δ),and value of relative error(RE).Compared to the traditional model,the machine learning constitutive model achieves higher prediction accuracy and better generalization *** offers a new approach for the establishment of flow constitutive models for other directionally solidified and single-crystal superalloys.

关键词： Ni-based superalloy constitutive model machine learning directional solidification anisotropy

Logic paradox under current corporate finance

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Journal of Modern Accounting and Auditing 2007年第11期3卷 41-43页

作者： yuan ye-hu School of Accounting Jiangxi University of Finance and Economics Nanchang 330013 China

The current corporate finance is based on the theory framework of new classical economics. Therefore, the main contents such as free cash flow, NPV method and capital structure decision-making are still based on the balanced price of product and capital markets, they still can＇t reflect the essential character of corporation. The logic paradox, causes the current corporate finance study under a more and more embarrassing circumstance in the front of enterprise financial management practice, with the feature of value management.

关键词： corporate finance capital market finance logic paradox

Effective strategies to promote Z(S)-scheme photocatalytic water splitting

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Chinese Chemical Letters 2024年第3期35卷 27-39页

作者： ye yuan Junan Pan Weinan Yin Haoxuan Yu Fengshun Wang Weifeng hu Longlu Wang Dafeng Yan College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China College of Chemistry and Chemical Engineering Hubei UniversityWuhan 430062China

Artificial Z(S)-scheme photocatalytic water splitting systems have attracted extensive attention due to their advantages such as wide light absorption range,high charge separation efficiency and strong carrier redox ***,it is still challenging to design and prepare Z(S)-scheme photocatalysts with low-cost and highly stability for efficiently photocatalytic overall water splitting using solar *** review mainly introduces various strategies to improve the photocatalytic water splitting performance of Z(S)-scheme *** strategies mainly focus on enhancing or extending the range of light absorption,promoting charge separation,and enhancing surface redox reaction in Z(S)-scheme ***,the main challenges of Z(S)-scheme photocatalytic water splitting systems and their future development directions are pointed *** review would be beneficial to understanding the challenges and opportunities faced by the research field of Z(S)-scheme photocatalytic systems,and has important guiding significance for the development and utilization of high-performance Z(S)-scheme photocatalytic reaction system in the future.

关键词： Z(S)-scheme Overall water splitting Light absorption Charge separation Loading co-catalyst

Trial application of the envelope method to the potential ambiguity problem

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Nuclear Science and Techniques 2024年第1期35卷 73-80页

作者： Li-yuan hu Yu-Shou Song Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering UniversityHarbin 150001China College of Nuclear Science and Technology Harbin Engineering UniversityHarbin 150001China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Ministry of Industry and Information TechnologyHarbin 150001China

The optical potential ambiguity is a long-standing problem in the analysis of elastic scattering *** a specific collid-ing system,ambiguous potential families can lead to different behaviors in the nearside and farside scattering *** contrast,the envelope method can decompose the experimental data into two components with negative and positive deflection angles,***,a question arises as to whether the comparison between the calculated nearside(or farside)component and the derived positive-deflection-angle(or negative-deflection-angle)component can help analyze the potential ambiguity *** this study,we conducted a trial application of the envelope method to the potential ambiguity *** envelope method was improved by including uncertainties in the experimental *** colliding systems of 16O+28Si at 215.2 MeV and 12C+12C at 1016 MeV were considered in the *** each colliding system,the angular distribution experimental data were described nearly equally well by two potential sets,one of which is“surface transpar-ent”and the other is *** calculated angular distributions were decomposed into nearside and farside scattering *** the improved envelope method,the experimental data were decomposed into the positive-deflection-angle and negative-deflection-angle components,which were then compared with the calculated nearside and farside *** capability of the envelope method to analyze the potential ambiguities was also discussed.

关键词： Elastic scattering Optical potential ambiguities Envelope method Nearside/farside decomposition

Simplified design of nonlinear damper parameters and seismic responses for long-span cable-stayed bridges with nonlinear viscous dampers

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 1103-1116页

作者： huihui LI Lifeng LI Rui hu Meng ye College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering Shenzhen UniversityShenzhen 518060China College of Civil Engineering Hunan UniversityChangsha 410082China

Viscous dampers are widely used as passive energy dissipation devices for long-span cable-stayed bridges for mitigation of seismic load-induced ***,complicated finite element(FE)modeling,together with repetitive and computationally intensive nonlinear time-history analyses(NTHAs)are generally required in conventional design *** streamline the preliminary design process,this paper developed a simplified longitudinal double degree of freedom model(DDFM)for single and symmetric twin-tower cable-stayed *** on the proposed simplified longitudinal DDFM,the analytical equations for the relevant mass-and stiffness-related parameters and longitudinal natural frequencies of the structure were derived by using analytical and energy *** of the relationship between the nonlinear viscous damper parameters and the equivalent damping ratio was achieved through the equivalent linearization ***,the analytical equations of longitudinal seismic responses for long-span cable-stayed bridges with nonlinear viscous dampers were *** on the developed simplified DDFM and suggested analytical equations,this paper proposed a simplified calculation framework to achieve a simplified design method of nonlinear viscous damper ***,the effectiveness and applicability of the developed simplified longitudinal DDFM and the proposed calculation framework were further validated through numerical analysis of a practical cable-stayed ***,the results indicated the following.1)For the obtained fundamental period and longitudinal stiffness,the differences between results of the simplified longitudinal DDFM and numerical analysis were only 2.05%and 1.5%,respectively.2)Relative calculation errors of the longitudinal girder-end displacement and bending moment of the bottom tower section of the bridge obtained from the simplified longitudinal DDFM were limited to less than 25%.3)The equivalent damping ratio of nonline

关键词： cable-stayed bridges viscous dampers simplified analytical model equivalent damping ratio seismic mitigation

MAUN:Memory-Augmented Deep Unfolding Network for Hyperspectral Image Reconstruction

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1139-1150页

作者： Qian hu Jiayi Ma yuan Gao Junjun Jiang Yixuan yuan Electronic Information School Wuhan UniversityWuhan 430072China School of Computer Science and Technology Harbin Institute of TechnologyHarbin 150001China Department of Electronic Engineering Chinese University of Hong KongHong Kong 999077China

Spectral compressive imaging has emerged as a powerful technique to collect the 3D spectral information as 2D *** algorithm for restoring the original 3D hyperspectral images(HSIs)from compressive measurements is pivotal in the imaging *** approaches painstakingly designed networks to directly map compressive measurements to HSIs,resulting in the lack of interpretability without exploiting the imaging *** some recent works have introduced the deep unfolding framework for explainable reconstruction,the performance of these methods is still limited by the weak information transmission between iterative *** this paper,we propose a Memory-Augmented deep Unfolding Network,termed MAUN,for explainable and accurate HSI ***,MAUN implements a novel CNN scheme to facilitate a better extrapolation step of the fast iterative shrinkage-thresholding algorithm,introducing an extra momentum incorporation step for each iteration to alleviate the information ***,to exploit the high correlation of intermediate images from neighboring iterations,we customize a cross-stage transformer(CSFormer)as the deep denoiser to simultaneously capture self-similarity from both in-stage and cross-stage features,which is the first attempt to model the long-distance dependencies between iteration *** experiments demonstrate that the proposed MAUN is superior to other state-of-the-art methods both visually and *** code is publicly available at https://***/huQ1an/MAUN.

关键词： Deep folding iteration

Application of non-mydriatic fundus photography-assisted telemedicine in diabetic retinopathy screening

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World Journal of Diabetes 2024年第2期15卷 251-259页

作者： Wan Zhou Xiao-Jing yuan Jie Li Wei Wang Hao-Qiang Zhang yuan-yuan hu Shan-Dong ye Department of Endocrinology The First Affiliated Hospital of University of Science and Technology of ChinaDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001Anhui ProvinceChina Department of Endocrinology Anhui Provincial HospitalAffiliated to Anhui Medical UniversityHefei 230001Anhui ProvinceChina

BACKGROUND Early screening and accurate staging of diabetic retinopathy(DR)can reduce blindness risk in type 2 diabetes ***’s complex pathogenesis involves many factors,making ophthalmologist screening alone insufficient for prevention and ***,endocrinologists are the first to see diabetic patients and thus should screen for retinopathy for early *** To explore the efficacy of non-mydriatic fundus photography(NMFP)-enhanced telemedicine in assessing DR and its various *** This retrospective study incorporated findings from an analysis of 93 diabetic patients,examining both NMFP-assisted telemedicine and fundus fluorescein angiography(FFA).It focused on assessing the concordance in DR detection between these two ***,receiver operating characteristic(ROC)curves were generated to determine the optimal sensitivity and specificity of NMFP-assisted telemedicine,using FFA outcomes as the standard *** In the context of DR diagnosis and staging,the kappa coefficients for NMFPassisted telemedicine and FFA were recorded at 0.775 and 0.689 respectively,indicating substantial intermethod ***,the NMFP-assisted telemedicine’s predictive accuracy for positive FFA outcomes,as denoted by the area under the ROC curve,was remarkably high at 0.955,within a confidence interval of 0.914 to 0.995 and a statistically significant P-value of less than *** predictive model exhibited a specificity of 100%,a sensitivity of 90.9%,and a Youden index of *** NMFP-assisted telemedicine represents a pragmatic,objective,and precise modality for fundus examination,particularly applicable in the context of endocrinology inpatient care and primary healthcare settings for diabetic *** implementation in these scenarios is of paramount significance,enhancing the clinical accuracy in the diagnosis and therapeutic management of *** methodology not only streamlines patient evaluation

关键词： Diabetes Diabetic retinopathy Non-mydriatic fundus photography-assisted telemedicine Fundus fluorescein angiography