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Ferrite features in simulated transition zone of EH36 shipbuilding steel submerged arc welded by CaF_(2)-SiO_(2)-MnO fluxes

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Journal of Iron and Steel Research International 2024年第4期31卷 790-796页

作者： Ming Zhong Dong hu Da-ming Guo Somnath Basu cong Wang Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Department of Metallurgical Engineering and Materials Science Indian Institute of Technology BombayMumbai 400076MaharashtraIndia

Ferrite features in the simulated transition zone welded with CaF_(2)-SiO_(2)-MnO fluxes containing various MnO contents have been *** laser scanning microscopy has been applied to simulate the thermal cycling of the transition zone and the phase transformations during cooling have been in-situ *** has been found that the appearance temperature for ferrite side plate decreases with increasing Mn content in the weld metals caused by MnO content ***,growth rates for both ferrite side plate and acicular ferrite are significantly enhanced with a higher Mn content of weld ***,from the statistical fractions of salient microstructures,for all samples,the acicular ferrite,grain boundary ferrite,and polygonal ferrite take over more than 90%.It has also been demonstrated that with the increase in Mn content,the ferrite side plate fraction increases slightly from 5%to 10%and the acicular ferrite fraction shows a tendency of first increasing and then decreasing,which experiences the maximum with the flux containing 30 wt.%*** phenomenon is believed to be controlled by the O and Mn contents in weld metals synergistically.

关键词： Submerged arc welding Transition zone Phase transformation Microstructure

Transfer matrix method for free and forced vibrations of multi-level functionally graded material stepped beams with different boundary conditions

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 983-1000页

作者： Xiaoyang SU Tong hu Wei ZHANG Houjun KANG Yunyue cong Quan YUAN School of Civil Engineering and Architecture Guangxi UniversityNanning 530004China Scientific Research Center of Engineering Mechanics Guangxi UniversityNanning 530004China State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures Guangxi UniversityNanning 530004China

Functionally graded materials(FGMs)are a novel class of composite materials that have attracted significant attention in the field of engineering due to their unique mechanical *** study aims to explore the dynamic behaviors of an FGM stepped beam with different boundary conditions based on an efficient solving *** the assumptions of the Euler-Bernoulli beam theory,the governing differential equations of an individual FGM beam are derived with Hamilton’s principle and decoupled via the separation-of-variable ***,the free and forced vibrations of the FGM stepped beam are solved with the transfer matrix method(TMM).Two models,i.e.,a three-level FGM stepped beam and a five-level FGM stepped beam,are considered,and their natural frequencies and mode shapes are *** demonstrate the validity of the method in this paper,the simulation results by ABAQUS are also *** this basis,the detailed parametric analyses on the frequencies and dynamic responses of the three-level FGM stepped beam are carried *** results show the accuracy and efficiency of the TMM.

关键词： transfer matrix method(TMM) free vibration forced vibration functionally graded material(FGM) stepped beam

Research on Willingness and Influenced Factors of Delayed Retirement

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International English Education Research 2018年第4期 7-9页

作者： hu cong Shanghai University of Engineering Science China

Extending the retirement age is an inevitable trend with the extension of the life expectancy of the population, reducing the financial burden of pensions, increasing the utilization rate of human capital, alleviating the shortage of the labor market and other social problems. More and more countries are beginning to impose extended retirement policies, like United States, South Korea, Canada and Nordic countries and so on, all have taken some measures to delay retirement. However, the general social recognition is not high. Both the aged group, the education level and the individual＇s lifestyle have a significant impact on the delayed retirement age policy. Severe aging situation puts the future pension system at risk, based on the interests of the country, delayed retirement will help utilize the human capital and relieve the country＇ s financial pressure; from individual perspective, extending retirement age can help reduce the provision for the aged people. This article based on previous literatures review, through conducted the survey of people in Halmstad to analyze the local citizen＇s perception on delayed retirement and the influencing factors behind. Concluded that willingness of delayed retirement among people is not very high, reasons vary from different kinds of people.

关键词： Delayed retirement Influenced factors People Willingness

南海北部内孤立波影响海域悬浮颗粒物特征变化研究

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海洋学报 2024年第6期46卷 114-129页

作者：王宏威乔玥冯学志朱超祁陈天胡聪孙中强孙均凯单红仙贾永刚中国海洋大学山东省海洋环境地质工程重点实验室山东青岛266100 中国海洋大学海洋环境与生态教育部重点实验室山东青岛266100 中国海洋大学海底科学与探测技术教育部重点实验室山东青岛266100

悬浮颗粒物在“源-汇”沉积体系中扮演着关键角色,而南海常见的动力现象—内孤立波,则被证实是影响悬浮颗粒物分布和沉积过程的重要因素。该项研究于2022年9月在吕宋海峡至东沙群岛海域开展,采用LISST-deep与CTD设备进行同步观测,以研... 详细信息

悬浮颗粒物在“源-汇”沉积体系中扮演着关键角色,而南海常见的动力现象—内孤立波,则被证实是影响悬浮颗粒物分布和沉积过程的重要因素。该项研究于2022年9月在吕宋海峡至东沙群岛海域开展,采用LISST-deep与CTD设备进行同步观测,以研究悬浮颗粒物的粒径及体积浓度分布。通过调查期内的卫星遥感数据,划定了内孤立波的影响范围,并结合海床基观测内孤立波影响悬浮颗粒物分布过程,从动力学的角度揭示了内孤立波对悬浮颗粒物在输运过程中特征变化的影响。研究发现:(1)在内孤立波的振幅深度区间(6~79 m)内,以较小粒径的悬浮颗粒物(15~25μm)分布为主,且越接近内孤立波的波谷深度,出现较小粒径悬浮颗粒物的频率越高。(2)悬浮颗粒物分布由内孤立波波峰线中心区域扩散到两侧,在中心为体积浓度低值区(≤91μL/L),而波峰线两侧区域与内孤立波传播路径远端区域为体积浓度高值区(≥500μL/L)。此外,研究进一步揭示了内孤立波通过改造作用使聚集状态的悬浮颗粒物被分解为粒径较小、组成单一的颗粒,通过控制作用改变悬浮颗粒物在波峰线不同位置、传播路径和振幅深度上的体积浓度分布,为理解南海源-汇沉积体系提供了重要的理论依据。

关键词：内孤立波悬浮颗粒物粒径分布颗粒特征改造控制作用

Laser Spot Center Detection and Comparison Test

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Photonic Sensors 2019年第1期9卷 49-52页

作者： Jun Zhu Zhengjie XU Deli FU cong hu College of Electronic Engineering Guangxi Normal UniversityGuilin 541004China Guangxi Key Laboratory of Automatic Detecting Technology and Instruments Guilin University of Electronic TechnologyGuilin 541004China

High efficiency and precision of the pot center detection are the foundations of avionics instrument navigation and optics measurement basis for many *** has noticeable impact on overall system *** them,laser spot detection is very important in the optical measurement *** order to improve the low accuracy of the spot center position,the algorithm is improved on the basis of the circle *** pretreatment is used by circle fitting,and the improved adaptive denoising filter for TV repair technology can effectively improves the accuracy of the spot center *** the same time,the pretreatment and de-noising can effectively reduce the influence of Gaussian white noise,which enhances the anti-jamming capability.

关键词： Spot TV repair technology spot center

Deterministic processes drive turnover-dominated beta diversity of breeding birds along the central Himalayan elevation gradient

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Avian Research 2024年第2期15卷 163-171页

作者： Zhifeng Ding Jianchao Liang Le Yang cong Wei huijian hu Xingfeng Si Guangdong Key Laboratory of Animal Conservation and Resource Utilization Institute of ZoologyGuangdong Academy of SciencesGuangzhouGuangdong510260China Tibet Plateau Institute of Biology Lhasa850001China Zhejiang Zhoushan Island Ecosystem Observation and Research Station Institute of Eco-ChongmingZhejiang Tiantong Forest Ecosystem National Observation and Research StationSchool of Ecological and Environmental SciencesEast China Normal UniversityShanghai200241China

Beta diversity,the variation of community composition among sites,bridges alpha and gamma diversity and can reveal the mechanisms of community assembly through applying distance-decay models and/or partitioning beta diversity into turnover and nestedness components from functional and phylogenetic *** as the most natural experiment system provide good opportunities for exploring beta diversity patterns and the underlying ecological ***,we simultaneously consider distance-decay models and multiple di-mensions of beta diversity to examine spatial variations of bird communities,and to evaluate the relative importance of niche-based and neutral community assembly mechanisms along a 3600-m elevational gradient in the central Himalayas,*** results showed that species turnover dominates taxonomic,functional,and phylogenetic beta *** observed strongest evidence of spatial distance decays in taxonomic similarities of birds,followed by its phylogenetic and functional *** component was highest in taxonomic beta diversity,while nestedness component was highest in functional beta ***,all correlations of assemblage similarity with climatic distance were higher than that with spatial *** values of overall taxonomic,functional,and phylogenetic beta diversity and their turnover components increase with increasing elevational distance,while the standardized values of taxonomic and phylogenetic nestedness decreased with increasing elevational *** results highlighted the niche-based deterministic processes in shaping elevational bird diversity patterns that were determined by the relative roles of decreasing trend of environmental filtering and increasing trend of limiting similarity along elevation distances.

关键词： Beta diversity Bird Community assembly Functional trait Himalaya Nestedenss Phylogenetic distance Turnover

A Novel Protein Found in Selenium-rich Silkworm Pupas

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Chinese Chemical Letters 2005年第10期16卷 1347-1350页

作者： De cong hu Qiong LIU hui Bi XU Hai Rong CUI Si Wang YU Xiao Da YANG Kui WANG Department of Chemistry Huazhong University of Science and Technology Wuhan 430074 Technology Center of hubei Entry-Exit Inspection and Quarantine Bureau Wuhan 430022 Department of Chemical Biology School of Pharmaceutical Sciences Peking University Beijing 100085

A novel protein was isolated and characterized in selenium-rich silkworm pupas. The peptide mass fingerprint of the protein was found to be new. Partial amino acid sequencing also confn-med to be a new protein. The no... 详细信息

关键词： Silkworm pupa selenium peptide mass fingerprint (PMF) amino acid sequence.

Optical manipulation of ratio-designable Janus microspheres

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Photonics Research 2024年第6期12卷 1239-1249页

作者： YULU CHEN cong ZHAI XIAOQING GAO HAN WANG ZUZENG LIN XIAOWEI ZHOU ChuNGUANG hu State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China

Angular optical trapping based on Janus microspheres has been proven to be a novel method to achieve controllable *** contrast to natural birefringent crystals,Janus microspheres are chemically synthesized of two compositions with different refractive ***,their structures can be artificially regulated,which brings excellent potential for fine and multi-degree-of-freedom manipulation in the optical ***,it is a considerable challenge to model the interaction of heterogeneous particles with the optical field,and there has also been no experimental study on the optical manipulation of microspheres with such designable refractive index *** the specific structure affects the kinematic properties of Janus microspheres remains ***,we report systematic research on the optical trapping and rotating of various ratio-designable Janus *** employ an efficient T-matrix method to rapidly calculate the optical force and torque on Janus microspheres to obtain their trapped postures and rotational characteristics in the optical *** have developed a robust microfluidic-based scheme to prepare Janus *** experimental results demonstrate that within a specific ratio range,the rotation radii of microspheres vary linearly and the orientations of microsphere are always aligned with the light polarization *** is of great importance in guiding the design of Janus *** their orientations flip at a particular ratio,all consistent with the *** work provides a reliable theoretical analysis and experimental strategy for studying the interaction of heterogeneous particles with the optical field and further expands the diverse manipulation capabilities of optical tweezers.

关键词： polarization ratio refractive

The riddles of number nine in Chinese medicine processing method

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Traditional Medicine Research 2021年第2期6卷 70-85页

作者： Xiang-Long Meng Xiao-Yan Zhang cong hu Xiao-Juan Su Shuo-Sheng Zhang College of Chinese Materia Medica and Food Engineering Shanxi University of Chinese MedicineJinzhong 030619China School of Pharmacy Jiangxi Science and Technology Normal UniversityNanchang 330013China

The“nine cycles of steaming and shining”,“nine making”,“nine turns”and“nine cycles of calcining and quenching”methods that are recorded and used since ancient times are merely one aspect of the unique processing methods of traditional Chinese *** the Chinese medicine processing method“nine cycles of steaming and shining”from historical review and summarizing the practical wisdom based on the canonical aspects of traditional Chinese medicine and the experiences of ancient Chinese medicine sages to promote the new development of traditional Chinese *** the long-term and multiple“nine”processing,the materials of traditional Chinese medicine exhibit significant beneficial changes in terms of taste,efficacy,and chemical composition contents,thus emphasizing that Chinese medicine processing plays a significant role in their efficacy enhancement and toxicity ***(Polygoni Multiflori Radix),Dihuang(Rehmanniae Radix),huangjing(Rhizoma Polygonati),Dahuang(Radix et Rhizoma Rhei),and Xixiancao(Herba Siegesbeckiae)are representatives of Chinese medicinal materials prepared using the“nine-system”processing *** review discovers the aim and the molecular mechanism of“nine”processing of the abovementioned herbs from the viewpoints of modern pharmacochemistry and pharmacology to provide a theoretical support for the“nine”processing method of traditional Chinese medicine and to promote the international market of traditional Chinese medicine.

关键词： Nine cycles of steaming and shining Chinese medicine processing Historical review Efficacy enhancement Toxicity reduction