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Nonlinear free vibration of reticulated shallow spherical shells taking into account transverse shear deformation

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Applied Mathematics and Mechanics(English Edition) 2018年第12期39卷 1825-1836页

作者： rong wang Guohua NIE School of Aerospace Engineering and Applied Mechanics Tongji University

This paper deals with nonlinear free vibration of reticulated shallow spherical shells taking into account the effect of transverse shear deformation. The shell is formed by beam members placed in two orthogonal directions. The nondimensional fundamental governing equations in terms of the deflection, rotational angle, and force function are presented, and the solution for the nonlinear free frequency is derived by using the asymptotic iteration method. The asymptotic solution can be used readily to perform the parameter analysis of such space structures with numerous geometrical and material parameters. Numerical examples are given to illustrate the characteristic amplitudefrequency relation and softening and hardening nonlinear behaviors as well as the effect of transverse shear on the linear and nonlinear frequencies of reticulated shells and plates.

关键词： nonlinear free vibration reticulated shallow spherical shell transverse shear effect asymptotical iteration method amplitude-frequency relation

Mastering Specificity of Acupoints Based on Clinical Verses of Acupuncture and Moxibustion

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Chinese Journal of Integrative Medicine 2019年第9期25卷 710-711页

作者： wang rong College of Acupuncture and Moxibustion Shanxi University of Traditional Chinese Medicine

The classic verses of acupuncture and moxibustion are the ancient records of the content of acupuncture and moxibustion in the form of songs, including meridians, acupoints, techniques, clinical treatment, medical cases, etc. About 20 articles among them summarize the valuable clinical experience of ancient famous acupuncturists. The verses are extremely useful. They prescribe a method of treating disease in which very few acupoints are selected (mostly only one, but sometimes two or three points). The point selection is based on the acupuncturists' advanced mastery of acupoint specificity, which practitioners today must learn. Unfortunately, because of the verses' simple expression, it is difficult for modern readers to understand them in depth. As a result, undergraduates majoring in acupuncture and moxibustion are no longer required to study the verses(1,2) This means that modern acupuncturists are unfamiliar with these verses and seldom use them in clinic practice. This greatly limits the application and promotion of the verses.

关键词： acupuncture and moxibustion ancient records As a result

Electromagnetic Resonant Properties of Metal-Dielectric-Metal （MDM） Cylindrical Microcavities

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Photonic Sensors 2017年第2期7卷 148-156页

作者： Hang HENG rong wang Center for Analysis and Testing Nanjing Normal University Nanjing 210097 China Department of Neurosurgery Nanjing Drum Tower Hospital Nanjing 210008 China The Affiliated Hospital of Nanjing University Medical School Nanjing 210008 China

Optical metamaterials can concentrate light interaction with quantum objects. In this paper, into extremely tiny volumes to enhance their a cylindrical microcavity based on the Au-dielectric-Au sandwiched structure is proposed. Numerical study shows that the cylindrical microcavity has the strong ability of localizing light and confining 10^3- - 10^4-fold enhancement of the electromagnetic energy density, which contains the most energy of the incoming light. The enhancement factor of energy density G inside the cavity shows the regularities as the change in the thickness of the dielectric slab, dielectric constant, and the radius of gold disk. At the normal incidence of electromagnetic radiation, the obtained reflection spectra operate in the range from 4.8 μm to 6μm and with the absorption efficiency C （C=1-Rmin）, which can reach 99% by optimizing the structure＇s geometry parameters, and the dielectric constant. Due to the symmetry of the cylindrical microcavities, this structure is insensitive to the polarization of the incident wave. The proposed optical metamaterials will have potential applications in the surface enhanced spectroscopy, new plasmonic detectors, bio-sensing, solar cells, etc.

关键词： Microcavity metal-semiconductor-metal metamaterial

Can Multiple Livelihood Interventions Improve Livelihood Resilience of Out-of-poverty Farmers in Mountain Areas?A Case Study of Longnan Mountain Area,China

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Chinese Geographical Science 2023年第5期33卷 898-916页

作者： wang rong ZHAO Xueyan College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China

Clarifying the impact of livelihood interventions on the livelihood resilience of farmers in undeveloped mountain areas can not only optimize interventions,but also provide experiential support for global poverty *** analyze the impact of multiple livelihood interventions on livelihood resilience,we constructed an analytical framework and analyzed the enjoyment of livelihood interventions and the heterogeneity of livelihood resilience among out-of-poverty farmers in the Longnan mountain areas,***,we studied the impact of intervention intensity on livelihood resilience through the multiple linear regression *** results revealed that:1)the livelihood interventions enjoyed by out-of-poverty farmer in mountain areas were *** proportion of farmers enjoyed diversified livelihood interventions was in descending order of high mountain areas,semi-mountain area and Chuanba valley areas.2)The overall livelihood resilience of farmers in Longnan mountain areas was generally low,with an average of *** were significant differences in the livelihood resilience of farmers across different geographic areas in the study area and types of interventions.3)The effects of industry interventions,employment interventions and education interventions were *** endogenous power of farmers not only had a significant positive effect on livelihood resilience,but also positively moderated the impact of the intensity of interventions on livelihood *** addition,the household dependency ratio and the average altitude of the village area had a significant negative impact on their livelihood resilience.

关键词： livelihood resilience livelihood interventions farmer Longnan mountain area,China

Influence of laser geometric morphology type on Si C surface wettability

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Science China(Technological Sciences) 2016年第4期59卷 592-596页

作者： wang rong BAI ShaoXian College of Mechanical Engineering Zhejiang University of Technology

To obtain effective surface morphology to control surface wettability, this work investigated the influence of protuberant and concave morphology, which are respectively represented by circle-dimpled and micro-square-convex morphology, on surface wettability. The geometric morphologies were processed on silicon carbide （SIC） surfaces by a laser-marking machine, and surface wettability was monitored by the measurement of contact angles using the sessile drop method. Correlation analysis between contact angles and morphology parameters was conducted to determine the extent of influence. The results showed that the circle-dimpled diameter had a signific^mt influence on surface wettability, whereas grooved width did not. Additionally the depth of dimples and grooves exerted less influence on controlling wetting behaviors. In addition, surface wettability transformed from a superhydrophilic state to a hydrophobic state on micro-square-convex surfaces; contact angles on cir- cle-dimpled surfaces showed a relatively slow transformation, though the surface wettability also underwent the state change.

关键词： circle-dimpled morphology micro-square-convex morphology wettability SiC

Nondestructive Nonlinear Optical Microscopy Revealed the Blackening Mechanism of Ancient Chinese Jades

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Research 2024年第3期2023卷 391-399页

作者： Yaxin Chen rong wang Minbiao Ji State Key Laboratory of Surface Physics and Department of Physics Human Phenome InstituteAcademy for Engineering and TechnologyKey Laboratory of Micro and Nano Photonic Structures(Ministry of Education)Yiwu Research Institute of Fudan UniversityFudan UniversityShanghai 200433China Department of Cultural Heritage and Museology Fudan UniversityShanghaiChina

Jade is most valued in Chinese culture since ancient times. For unearthed jade artifacts, the alteration color resulting from weathering effects and human activities provides information for cultural heritage conservation, archaeology, and history. Currently, the noninvasive 3-dimensional characterization of jade artifacts with high chemical and spatial resolution remains challenging. In this work, we applied femtosecond pump–probe microscopy and second harmonic generation microscopy techniques to study the black alteration of an ancient jade artifact of the late Spring and Autumn period (546 to 476 BC). The direct cause of the “mercury alteration” phenomena was discovered to be the conversion of metacinnabar from buried cinnabar in the tomb. Furthermore, a 3-dimensional optical reconstruction of the black alteration was achieved, providing a high-resolution method for analyzing the blackening mechanism without the need of sample damage. Our approach opens up new opportunities to extract microscopic spatiochemical information for a broad range of alteration colors in jade artifacts.

关键词： pump Nonlinear buried

Hardware design of a localization system for staff in high-risk manufacturing areas

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第1期14卷 1-10页

作者： Rui-rong wang rong-rong YE Cui-fei XU Jian-zhong wang An-ke XUE Institute of Information and Control Hangzhou Dianzi University

In this paper, we propose a hardware design for an effective real time indoor localization system for staff working in high-risk manufacturing areas. Because of the special requirements of our system, the chirp spread spectrum （CSS） is the most suitable indoor localization technology. The details of the new localization system are described. The system involves several anchors, tags, and a gateway, all of which use the nanoLOC TRX transceiver （NASTR1） RF chip （Nanotron Co., Germany）, which is based on the CSS technology. To validate the effectiveness of our system, both ranging and localization tests were carried out. The difference between the ranging accuracy indoors and outdoors was small. The localization system can position indoor mobile staffprecisely, enabling the establishment of an emergency rescue mechanism.

关键词： Wireless indoor localization High-risk manufacturing area Chirp spread spectrum (CSS) NanoLOC TRXtransceiver (NA5 TR 1 )

Effect of organic binders on the activation and properties of indurated magnetite pellets

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International Journal of Minerals,Metallurgy and Materials 2021年第7期28卷 1145-1152页

作者： Cui wang Chen-yang Xu Zheng-jian Liu Yao-zu wang rong-rong wang Li-ming Ma State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Ferrous Metallurgy RWTH Aachen UniversityIntzestraße 152072 AachenGermany

In the ironmaking process,the addition of an organic binder to replace a portion of bentonite has the potential to improve the per-formance of *** interaction between original bentonite(OB)and organic binder was *** indicated that the micromor-phology of organic composite bentonite(OCB)became porous and the infrared difference spectrum exhibited a curved *** addition,the residual burning rates of OB and organic binder were determined to be 82.72%and 2.30%,***,the influence of OCB on the properties of pellets was *** compressive strength of OCB-added green pellets(14.7 N per pellet)was better than that of OB-ad-ded pellets(10.3 N per pellet).Moreover,the range of melting temperature of OCB-added green pellets(173℃)was narrower than that of OB-added pellets(198℃).The compressive strength of OCB-added green pellets increased from 2156 to 3156 N per pellet with the increase in roasting temperature from 1200 to 1250℃.

关键词： pellets organic composite bentonite softening-melting property interaction behavior

Thermal-induced transformation of wetting behaviors on laser-textured SiC surfaces

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Science China(Technological Sciences) 2016年第6期59卷 862-866页

作者： BAI Shao Xian wang rong College of Mechanical Engineering Zhejiang University of Technology

Thermal-induced transformation of wetting behaviors on laser-textured silicon carbide （SIC） surfaces was discussed in this work. To investigate the transformation, a quenching experiment was conducted and an X-ray diffractometer was used to measure the residual stress. The experimental results demonstrate that the significantly enhanced hydrophilicity was induced by the increasing thermal residual stress of SiC materials after the aqueous quenching. It was found that the decrease in the contact angle increased with the increasing quenching temperature. Quenching at 350℃ led to the change of contact angle from 89.28° to 70.88° for the smooth surface, while from 72.25° to 33.75° for the laser-textured surface with depth 8 μm. Further, the surface hydrophobicity was enhanced by the release of thermal residual stress after quenching, thereby leading to an increase in the contact angle over time. The transformation of wetting behaviors on laser textured SiC surfaces can be achieved mutually by the aqueous quenching method.

关键词： wettability transformation silicon carbide laser processing aqueous aquenching