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Roles of different physical processes in upper ocean responses to Typhoon Rammasun(2008)-induced wind forcing

Science China Earth Sciences 2019年第4期62卷 684-692页

作者： Yuhua pei rong-hua ZHANG Dake CHEN State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural Resources CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao National Laboratory for Marine Science and Technology University of Chinese Academy of Sciences

This study investigates the roles of different physical processes in the oceanic response to tropical cyclones(TCs) in the Pacific, using an ocean general circulation model with several numerical experiments. A case study is focused on Typhoon Rammasun, which passed through the northwestern tropical Pacific in May 2008. TC-induced wind stress fields are extracted using a locally-weighted regression(Loess) method from a six-hourly Cross-Calibrated Multi-Platform satellite scatterometer wind product. By comparing model experiments with TC wind forcing being explicitly included or not, the effects of TC on the ocean are isolated in a clean way. The local oceanic response is characterized by a cooling in the surface layer that persists along the typhoon track as a cold wake, and a deepening of the mixed layer(ML). The TC-induced wind can affect the ocean through the momentum effects, the ML processes(the stirring effect on the ML depth), and heat flux(via wind speed), *** of numerical experiments with these different underlying processes explicitly represented or not indicate that vertical mixing and upwelling are dominant processes responsible for surface cooling, while the surface heat flux also plays a nonnegligible role. Specifically, vertical mixing, upwelling and surface heat flux account for respectively ～53%, ～31% and ～16% of the sea surface temperature cooling. However, for the ML response, the vertical mixing and surface heat flux are dominant processes for the ML deepening, while the contribution from upwelling process is negligible. This study provides new insights into how TC-indcued wind forcing affects the ocean by isolating each different individual process in a clear way, which differs from previous direct heat budget analyses.

关键词： Ocean response to typhoon Ocean modeling Vertical mixing The tropical Pacific

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基于ECA-Net的双信息流图像字幕生成方法研究

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光电子·激光 2025年第1期36卷 27-35页

作者：刘仲民苏融胡文瑾兰州理工大学电气工程与信息工程学院甘肃省工业过程先进控制重点实验室西北民族大学数学与计算机科学学院

针对图像字幕生成中由于视觉信息不足使生成的描述语句与图像内容不匹配的问题，提出一种基于高效通道注意力(efficient channel attention network, ECA-Net)的双信息流图像字幕生成方法。首先，该方法将图像分割特征作为另一个视觉信... 详细信息

针对图像字幕生成中由于视觉信息不足使生成的描述语句与图像内容不匹配的问题，提出一种基于高效通道注意力(efficient channel attention network, ECA-Net)的双信息流图像字幕生成方法。首先，该方法将图像分割特征作为另一个视觉信息源，采用迭代独立层归一化(iterative independent layer normalization, IILN)模块融合分割特征和网格特征，以双信息流网络提取图像特征；其次，在编码器中添加ECA-Net模块，通过跨通道交互学习图像特征之间的相关性，使预测结果更加关注视觉内容。最后，解码器根据提供的视觉信息和部分生成的字幕预测下一个词组，从而生成准确的字幕。在MSCOCO数据集上进行实验证明，该方法可以增强图像视觉信息之间的依赖性，使生成字幕相关度更高、语法更准确。

关键词：字幕生成通道注意力编解码器双信息流

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BIOPOLYMER BASED NANO-DELIVERY SYSTEMS FOR ENHANCING BIOAVAILABILITY OF NUTRACEUTICALS

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Chinese Journal of Polymer Science 2013年第9期31卷 1190-1203页

作者： Bing hu Qing-rong huang College of Food Science and Technology Nanjing Agricultural University Department of Food Science Rutgers University

Recently, there has been an increasing interest in the development of efficient food-grade oral nano-delivery systems for encapsulation, protection and target delivery of nutraceuticals to enhance their bioavailability, fiarther to prevent disease and promote human health and well-being. Food proteins represent promising candidates for efficient nutraceutical nanocarriers due to their exceptional characteristics, namely biodegradability, nonantigenicity, high nutritional value, abundant renewable sources and extraordinary binding capacity to various nutraceuticals. In addition, their biocompatibility, biodegradability, low toxicity, low cost, and non-starch polysaccharides possess many favourable characteristics such as stability in the harsh gastric environment, resistance to digestive enzymes, and mucoadhesiveness to intestinal mucosal surface. This review describes the design and formation of nanoscaled delivery systems for nutraceuticals using food-grade proteins （including peptides）, polysaccharides and their associative complexes. The toxicity and cellular uptake fate of the nanostructures, as well as their effects on the intestinal absorption of the encapsulated nutraceuticals were also discussed.

关键词： Food biopolymer Nano-delivery systems Bioavailability Nutraceuticals.

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VIBRATION CHARACTERISTICS OF FLUID-STRUCTURE INTERACTION OF CONICAL SPIRAL TUBE BUNDLE

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Journal of Hydrodynamics 2010年第1期22卷 121-128页

作者： YAN Ke GE pei-qi BI Wen-bo SU Yan-cai hu Rui-rong Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of Education School of Mechanical Engineering Shandong University Jinan 250061 China

Heat transfer enhancement is achieved by flow-induced vibration in elastic tube bundles heat exchangers. For a further understanding of heat transfer enhancement mechanism and tube structure optimization, it is of importance to study the vibration characteristics of fluid-structure interaction of tube bundles. The finite element method is applied in the study of fluid-structure interaction of a new type elastic heat transfer element, i.e., the dimensional conical spiral tube bundle. The vibration equation and element matrix for the tube are set up by the regulation of different helical angles and coordinate transformation, together with the simplification of the joint body of the two pipes. The vibration characteristics of conical spiral tube bundle are analyzed at different velocities of the tube-side flow, and the critical velocity of vibration buckling is obtained. The results show that the natural frequency of the tube bundle decreases as the flow speed increases, especially for the first order frequency, and the critical velocity of vibration buckling is between 1.2665 m/s-1.2669 m/s. The vibration mode of conical spiral tube bundle is mainly z-axial, which is feasible to be induced and controlled.

关键词： conical spiral tube heat exchanger finite element method fluid-structure interaction vibration characteristics

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How to Promote Sales: Discount Promotion or Coupon Promotion?

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Journal of Systems Science and Systems Engineering 2020年第4期29卷 381-399页

作者： Peng Wiang rong Du Qiying hu School of Economics and Management Xidian UniversityXi'an 710126China School of Management Fudan UniversityShanghai 200433China

In this paper,we examine how a merchant should choose between discount promotion(offering a discount through an online third-party promotion platform)and coupon promotion(ssuing on-package coupons directly to consumers).We develop a two-period model in which the merchant optimizes the promotion decision in the first period and does not promote in the second *** identify two consumer segments:informed consumers who are aware of the merchant's offering at the beginning of the first period and know the true quality of the product,and uninformed consumers who are not aware of the merchant's offering at the beginning of the first period and underestimate the product ***,the merchant has access only to informed consumers when adopting coupon promotion or when choosing not to promote,while the merchant can access both informed consumers and uninformed consumers when offering discount *** this setting,we find that the merchant should offer discount promotion when the quality estimation of uninformed consumers is large and/or when the proportion of informed consumers is small;otherwise,the merchant should adopt coupon promotion when the effect of coupons in the first period is large and choose not to promote when the effect of coupons in the first period is small.

关键词： Sales promotions on-package coupons coupon promotion discount promotion delayed in-centive

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Retarding the precipitation of η phase in Fe-Ni based alloy through grain boundary engineering

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Journal of Materials Science & Technology 2020年第12期47卷 152-161页

作者： Honglei hu Mingjiu Zhao Lijian rong Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of China96 Jinzhai RoadHefei 230026China

It is important to inhibit the precipitation of η phases in precipitation strengthened Fe-Ni based alloys,as they will deteriorate not only the mechanical property but also the hydrogen *** present investigation shows that grain boundary engineering(GBE) can retard the formation and growth of ηphase in J75 *** GBE treatment with 5% cold rolling followed by annealing at 1000℃ for 1 h,the fraction of special boundaries(SBs) increases from 38.4% in conventional alloy to 77.2% and the fraction of special triple junctions increases from 10% to 74%.During 800℃ aging treatment,quite amount of cellular η phases adjacent to random grain boundary(RGB) will be found in conventional alloy,and only a few small η phases have been observed in GBE treatment alloy subjected to the same aging treatment for long *** reason for GBE in inhibiting precipitation of η phase can be attributed to not only introducing high fraction of SBs but also breaking the connectivity of RGB *** nucleation and growth of η phases on SBs are difficult due to their lower Ti concentration and diffusion rate,and the disruption of RGB networks reduces supply of Ti atoms to the η phases significantly,which impedes their growth at RGB.

关键词： Fe-Ni based alloy ηphase Precipitation behavior Random grain boundary connectivity Grain boundary engineering Boundary diffusion

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Study on 6-DOF active vibration-isolation system of the ultra-precision turning lathe based on GA-BP-PID control for dynamic loads

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Advances in Manufacturing 2024年第1期12卷 33-60页

作者： Bo Wang Zhong Jiang pei-Da hu Department of Precision Instrument Tsinghua UniversityBeijing100084People’s Republic of China Institute of Machinery Manufacturing Technology China Academy of Engineering PhysicsMianyang621900SichuanPeople’s Republic of China

The vibration disturbance from an external environment affects the machining accuracy of ultra-precision machining *** active vibration-isolation systems(AVIS)have been developed based on static *** a vibration-isolation load changes dynamically during ultra-precision turning lathe machining,the system parameters change,and the efficiency of the active vibration-isolation system based on the traditional control strategy *** solve this problem,this paper proposes a vibration-isolation control strategy based on a genetic algorithm-back propagation neural network-PID control(GA-BP-PID),which can automatically adjust the control parameters according to the machining ***-isolation simulations and experiments based on passive vibration isolation,a PID algorithm,and the GA-BP-PID algorithm under dynamic load machining conditions were *** experimental results demonstrated that the active vibration-isolation control strategy designed in this study could effectively attenuate vibration disturbances in the external environment under dynamic load *** design is reasonable and feasible.

关键词： Ultra-precision diamond turning lathe Active vibration isolation Six degrees of freedom Dynamic load Genetic algorithm-back propagation neural network-PID(GA-BP-PID)control

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Corneal collagen crosslinking in keratoconus and other eye disease

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International Journal of Ophthalmology(English edition) 2015年第2期8卷 407-418页

作者： Adel Alhayek pei-rong Lu Department of Ophthalmology the First Affiliated Hospital of Soochow University

Keratoconus is a condition characterized by biomechanical instability of the cornea, presenting in a progressive, asymmetric and bilateral way. Corneal collagen crosslinking(CXL) with riboflavin and Ultraviolet-A(UVA) is a new technique of corneal tissue strengthening that combines the use of riboflavin as a photo sensitizer and UVA irradiation. Studies showed that CXL was effective in halting the progression of keratoconus over a period of up to four years. The published studies also revealed a reduction of max K readings by more than 2 D, while the postoperative spherical equivalent(SEQ) was reduced by an average of more than 1 D and refractive cylinder decreased by about1 D. The major indication for the use of CXL is to inhibit the progression of corneal ecstasies, such as keratoconus and pellucid marginal degeneration. CXL may also be effective in the treatment and prophylaxis of iatrogenic keratectasia, resulting from excessively aggressive photo ablation. This treatment has been used to treat infectious corneal ulcers with apparent favorable results. Most recent studies demonstrate the beneficial impact of CXL for iatrogenic ecstasies, pellucid marginal degeneration, infectious keratitis, bullous keratopathy and ulcerative keratitis. Several long-term and short-term complications of CXL have been studied and documented. The possibility of a secondary infection after the procedure exists because the patient is subject to epithelial debridement and the application of a soft contact lens. Formation of temporary corneal haze,permanent scars, endothelial damage, treatment failure,sterile infiltrates, bullous keratopathy and herpes reactivation are the other reported complications of this procedure.

关键词： keratoconus collagen corneal cross-linking ultraviolet radiation and riboflavin

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Design of non-polarizing thin film edge filters

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第6期7卷 1037-1040页

作者： GU pei-fu ZHENG Zhen-rong State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 China

The separation between s- and p-polarization components invariably affects thin film edge filters used for tilted incidence and is a difficult problem for many applications, especially for optical communication. This paper presents a novel design method to obtain edge filters with non-polarization at incidence angle of 45°. The polarization separation at 50% trans-mittance for a long-wave-pass filter and a short-wave-pass filter is 0.3 nm and 0.1 nm respectively. The design method is based on a broadband Fabry-Perot thin-film interference filter in which the higher or lower interference band at both sides of the main transmittance peak can be used for initial design of long-wave-pass filter or short-wave-pass filter and then can be refined to reduce the transmittance ripples. The spacer 2H2L2H or 2L2H2L of the filter is usually taken. Moreover, the method for expanding the bandwidth of rejection and transmission is explained. The bandwidth of 200 nm for both rejection region and transmission band is obtained at wavelength 1550 nm. In this way, the long-wave-pass and short-wave-pass edge filters with zero separation between two polarization components can easily be fabricated.

关键词： Thin film optics Interference edge filters Non-polarization design

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Seasonal variability of the Kuroshio Current at the PN Section in the East China Sea based on in-situ observation from 1987 to 2010

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Acta Oceanologica Sinica 2015年第5期34卷 12-21页

作者： WEI Yanzhou pei Yuhua ZHANG rong-hua Key Laboratory of Ocean Circulation and Wave Institute of OceanologyChinese Academy of Sciences University of the Chinese Academy of Sciences State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration College of Physical and Environmental Oceanography Ocean University of China

As the spatio-temporal variability of the Kuroshio is highly influenced by mesoscale eddies, representing its seasonal variability characteristics requires sufficiently long term observations to reduce the uncertainties. Geostrophic velocity data estimated from hydrographic observation from 1987 to 2010 and the shipboard ADCP velocity data from 1993 to 2008 at the PN Section in the central East China Sea are collected to view the seasonal variability objectively. From both types of observation, it is found that the seasonal climatology mean of the Kuroshio Current exhibits significant difference in three areas, which are located at the Kuroshio Current core and its two flanks in a shallow layer less than 300 m, with the weakest northeast current at the core in autumn, the strongest counter current on the right flank in spring, and the strongest northeast current on the left flank in autumn, respectively. The seasonal variance of the Kuroshio Current also exhibits significant difference on the off- shore side of the Kuroshio, with larger variance in spring and summer while smaller variance in autumn and winter. For the current parallel to the PN Section, the ratio of the seasonal variability component to the intraseasonal variability component is relatively smaller than that for the current perpendicular to the PN Section. Further analyses indicate that the seasonal variability at the PN Section is tightly linked to the upstream and downstream current variability.

关键词： Kuroshio Current seasonal variability East China Sea significance test

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