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Dynamically self-adjustable liquid-liquid and self-adaptive softcontact solid-solid triboelectric nanogenerator for wave energy harvesting

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Nano Research 2025年第1期18卷 404-414页

作者： Yong Long Bingqi Zhao Jianan Niu Yuxiu Liu wei sha Jiangwen Wang Zhong Lin Wang weiguo Hu Guangzhou Institute of Blue Energy Knowledge CityHuangpu DistrictGuangzhou 510555China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China

Water wave energy exhibits great potential toalleviate the global energy crisis. However, harvesting andutilizing wave energy are challenging due to its irregularity,randomness, and low frequency. Triboelectric nanogenerators(TENGs) have gained significant attention for harvesting waveenergy with high efficiency. This study presents a novelellipsoidal, pendulum-like TENG integrating both liquid-liquid(L-L) and solid-solid (S-S) triboelectricity (LS-TENG). Thisinnovative design enables continuous wave energy harvestingand self-powered marine environment monitoring under variousconditions, including temperature, humidity, and light intensity. The binary immiscible liquids within the LS-TENG’s innersoft balloon create dynamic, and self-adjustable L-L contact interfaces, significantly increasing the L-L contact area andenhancing L-L contact electrification (CE). The unique self-adaptive, soft S-S contact increases the S-S contact areacompared to traditional hard point contact, better adapting to the irregular movements of waves and promoting efficient S-SCE. The LS-TENG achieves highly efficient wave energy harvesting by coupling L-L and S-S CE. Furthermore, the uniquesoft contact design protects the S-S interfaces from mechanical wear and damage during long-term work. The LS-TENG’snovel structure provides an innovative and effective way for water wave energy harvesting.

关键词： self-adaptive soft-contact solid-solid liquid-liquid self-adjustable triboelectric nanogenerator

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Will polycentric cities cause more CO2 emissions? A case study of 232 Chinese cities

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Journal of Environmental Sciences 2020年第10期32卷 33-43页

作者： wei sha Ying Chen Jiansheng Wu Zhenyu Wang Key Laboratory for Urban Habitat Environmental Science and Technology School of Urban Planning and DesignPeking UniversityShenzhen 518055China Laboratory for Earth Surface Processes Ministry of EducationCollege of Urban and Environmental SciencesPeking UniversityBeijing 100871China

From 2000 to 2010 China experienced rapid economic development and *** cities in economically developed areas have developed from a single-center status to *** this study,we used exploratory spatial data analysis (ESDA) to identify the population centers,which identified 232 cities in China as having urban *** was used to represent urban agglomeration,and POLYD (representing how far is the city’s sub-centers to the main center),POLYC (representing the number of a city’s centers),and POLYP (representing the population distributed between the main center and the sub-centers) were used to indicate urban *** light data were used to determine the CO2 emissions from various cities in China.A mixed model was used to study the impact of urban aggregation and polycentric data on the CO2 emission efficiency in 2000 and *** study found that cities with higher compactness were distributed in coastal areas,and the cities with higher multicentricity were distributed in the Yangtze River Delta and shandong *** more compact the city was,the less conducive it was to improving CO2 emission *** development of the city was conducive to improving the CO2 emission efficiency,but the number of urban centers had no significant relationship with the CO2 emission *** research showed that the compactness and multicentricity of the city had an impact on the CO2 emission efficiency and provided some planning suggestions for the low carbon development of the city.

关键词： CO_2 emission efficiency polycentricity compactness Chinese cities

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An improved interval model updating method via adaptive Kriging models

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Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 497-514页

作者： sha wei Yifeng CHEN Hu DING Liqun CHEN shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China

Interval model updating(IMU)methods have been widely used in uncertain model updating due to their low requirements for sample ***,the surrogate model in IMU methods mostly adopts the one-time construction *** makes the accuracy of the surrogate model highly dependent on the experience of users and affects the accuracy of IMU ***,an improved IMU method via the adaptive Kriging models is *** method transforms the objective function of the IMU problem into two deterministic global optimization problems about the upper bound and the interval diameter through universal grey *** optimization problems are addressed through the adaptive Kriging models and the particle swarm optimization(PSO)method to quantify the uncertain parameters,and the IMU is *** the construction of these adaptive Kriging models,the sample space is gridded according to sensitivity *** sampling is then performed in key subspaces based on the maximum mean square error(MMSE)*** interval division coefficient and random sampling coefficient are adaptively adjusted without human interference until the model meets accuracy *** effectiveness of the proposed method is demonstrated by a numerical example of a three-degree-of-freedom mass-spring system and an experimental example of a butted cylindrical *** results show that the updated results of the interval model are in good agreement with the experimental results.

关键词： interval model updating(IMU) non-probabilistic uncertainty adaptive Kriging model surrogate model grey number

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Microstructure Evolution of a 10Cr Heat-Resistant Steel during High Temperature Creep

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Journal of Materials Science & Technology 2011年第4期27卷 344-351页

作者： Ping Hu wei Yan wei sha wei Wang Yiyin shan Ke Yang Institute ofMetal Research Chinese Academy of Sciences Shenyang 110016 China Graduate School of Chinese Academy of Sciences Beijing 100049 China School of Planning Architecture and Civil Engineering Queen's University of Belfast Belfast BT71NN UK Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou 510080 China

The microstructure evolution of a 10Cr ferritic/martensitic heat-resistant steel during creep at 600℃ was investigated in this work. Creep tests demonstrated that the 10Cr steel had higher creep strength than conventional ASME-P92 steel at 600℃. The rnicrostructure after creep was studied by transmission electron microscopy, scanning electron microscopy and electron probe microanalysis. It was revealed that the martensitic laths were coarsened with time and eventually developed into subgrains after 8354 h. Laves phase was observed to grow and cluster along the prior austenite grain boundaries during creep and caused the fluctuation of solution and precipitation strengthening effects, which was responsible for the two slope changes on the creep rupture strength vs rupture time curve. It was also revealed that the microstructure evolution could be accelerated by stress, which resulted in the lower hardness in the deformed part of the creep specimen, compared with the aging part.

关键词： Ferrous metals and alloys Creep Microstructure

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Management of primary ciliary dyskinesia/Kartagener＇s syndrome in infertile male patients and current progress in defining the underlying genetic mechanism

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Asian Journal of Andrology 2014年第1期16卷 101-106页

作者： Yan-wei sha Lu Ding Ping Li Reproductive Medicine Center Maternal and Child Health Hospital of Xiamen Xiamen China

Kartagener＇s syndrome （KS） is an autosomal recessive genetic disease accounting for approximately 50% of the cases of primary ciliary dyskinesia （PCD）. As it is accompanied by many complications, PCD/KS severely affects the patient＇s quality of life. Therapeutic approaches for PCD/KS aim to enhance prevention, facilitate rapid definitive diagnosis, avoid misdiagnosis, maintain active treatment, control infection and postpone the development of lesions. In male patients, sperm flagella may show impairment in or complete absence of the ability to swing, which ultimately results in male infertility. Assisted reproductive technology will certainly benefit such patients. For PCD/KS patients with completely immotile sperm, intracytoplasmic sperm injection may be very important and even indispensable. Considering the number of PCD/KS susceptibility genes and mutations that are being identified, more extensive genetic screening is indispensable in patients with these diseases. Moreover, further studies into the potential molecular mechanisms of these diseases are required. In this review, we summarize the available information on various aspects of this disease in order to delineate the therapeutic objectives more clearly, and clarify the efficacy of assisted reproductive technology as a means of treatment for patients with PCD/KS-associated infertility.

关键词： assisted reproductive technology clinical diagnosis and treatment genetic mechanism Kartagener's syndrome malefertifity, primary ciliary dyskinesia

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Targeted energy transfer of a parallel nonlinear energy sink

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Applied Mathematics and Mechanics(English Edition) 2019年第5期40卷 621-630页

作者： Yimin wei sha wei Qianlong ZHANG Xinjian DONG Zhike PENG Wenming ZHANG State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University

A parallel nonlinear energy sink(NES) is proposed and analyzed. The parallel NES is composed of a vibro-impact(VI) NES and a cubic NES. The dynamical equation is given, and the essential analytical investigation is carried out to deal with the cubic nonlinearity and impact nonlinearity. Multiple time-scale expansion is introduced, and the zeroth order is derived to give a rough outline of the system. The underlying Hamilton dynamic equation is given, and then the optimal stiffness is expressed. The clearance is regarded as a critical factor for the VI. Based on the periodical impact treatment by analytical investigation, the relationships of the cubic stiffness, the clearance, and the zeroth-order attenuation amplitude of the linear primary oscillator(LPO) are obtained.A cubic NES under the optimal condition is compared with the parallel NES. Harmonic signals, harmonic signals with noises, and the excitation generated by a second-order?lter are considered as the potential excitation forces on the system. The targeted energy transfer(TET) in the designed parallel NES is shown to be more e?cient.

关键词： targeted energy transfer (TET) nonlinear energy sink (NES) nonlinear vibration absorber impact vibration reduction

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Addition of the T5 exonuclease increases the prime editing efficiency in plants

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Journal of Genetics and Genomics 2023年第8期50卷 582-588页

作者： Zhen Liang Yuqing Wu Yingjie Guo sha wei School of Life Science Shanxi UniversityTaiyuanShanxi 030006China Research Institute of Big Data Science and Industry Shanxi UniversityTaiyuanShanxi 030006China

Prime editing(PE)is a versatile genome editing tool without the need for double-stranded DNA breaks or donor DNA templates,but is limited by low editing *** previously fused the M-MLV reverse transcriptase to the Cas9 nickase,generating the PE2(v1)system,but the editing efficiency of this system is still *** we develop different versions of PE2 by adding the 50-to-30 exonuclease at different positions of the nCas9-M-MLV RT fusion ***2(v2),in which the T5 exonuclease fused to the N-terminus of the nCas9-MMLV fusion protein enhances prime editing efficiency of base substitutions,deletions,and insertions at several genomic sites by 1.7-to 2.9-fold in plant cells compared to PE2(v1).The improved editing efficiency of PE2(v2)is further confirmed by generating increased heritable prime edits in stable transgenic plants compared to the previously established PE-P1,PE-P2,and PPE *** PE2(v2),we generate herbicide-resistant rice by simultaneously introducing mutations causing amino acid substitutions at two target *** PE efficiency is further improved by combining PE2(v2)and *** together,the increased genome editing efficiency of PE2(v2)developed in this study may enhance the applications of PE in plants.

关键词： Prime editing CRISPR T5 exonuclease Genome editing

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Dynamic modeling of fluid-conveying pipes restrained by a retaining clip

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Applied Mathematics and Mechanics(English Edition) 2023年第8期44卷 1225-1240页

作者： Bo DOU Hu DING Xiaoye MAO sha wei Liqun CHEN shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China State-owned Machinery Factory in Wuhu Wuhu 241007Anhui ProvinceChina shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China

Although most pipes are restrained by retaining clips in aircraft,the influence of the clip parameters on the vibration of the fluid-conveying pipe has not been *** considering the clip width,a new dynamic model of a fluid-conveying pipe restrained by an intermediate clip is established in this *** demonstrate the necessity of the proposed model,a half pipe model is established by modeling the clip as one *** comparing the two models,it is found that the half pipe model overestimates the critical velocity and may estimate the dynamical behavior of the pipe *** addition,with the increase in the clip stiffness,the conversion processes of the first two modes of the pipe are ***,by ignoring the width of the clip,the effect of the flow velocity on the accuracy of a concentrated restraint clip model is *** the flow velocity is close to the critical velocity,the accuracy of the concentrated restraint clip model significantly reduces,especially when the width of the clip is *** general,the contribution of this paper is to establish a dynamic model of the fluid-conveying pipe which can describe the influence of the clip parameters,and to demonstrate the necessity of this model.

关键词： fuid-conveying pipe retaining clip natural frequency mode critical velocity

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Parametric identification of time-varying systems from free vibration using intrinsic chirp component decomposition

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Acta Mechanica Sinica 2020年第1期36卷 188-205页

作者： sha wei Shiqian Chen Xingjian Dong Zhike Peng Wenming Zhang School of Mechanics and Engineering Science Shanghai UniversityShanghai200072China shanghai Institute of Applied Mathematics and Mechanics Shanghai UniversityShanghai200072China shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai UniversityShanghai200072China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai200240China

Time-varying systems are applied extensively in practical applications,and their related parameter identification techniques are of great significance for structural health monitoring of time-varying *** improve the identification accuracy for time-varying systems,this study puts forward a novel parameter identification approach in the time-frequency domain using intrinsic chirp component decomposition(ICCD).ICCD is a powerful tool for signal decomposition and parameter extraction,with good signal reconstruction capability in a high-noise *** maintain good identification effects for the time-varying system in a noisy environment,the proposed method introduces a redundant Fourier model for the non-stationary signal,including instantaneous frequency(IF)and instantaneous amplitude(IA).The accuracy and effectiveness of the proposed approach are demonstrated by a single-degree-of-freedom system with three types of time-varying parameters,as well as an example of a multi-degree-of-freedom *** effects of different levels of measured noise on the identified results are also discussed in *** results show that the proposed method is very effective in tracking the smooth,periodical,and non-smooth variations of time-varying systems over the entire identification time period even when the response signal is contaminated by intense noise.

关键词： System identification Time-varying system Time-frequency domain Intrinsic chirp component decomposition

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Recent progress of gastroesophageal reflux after endoscopic myotomy

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World Journal of Gastroenterology 2024年第34期30卷 3926-3928页

作者： Xuan Yan wei-Hong sha The First School of Clinical Medicine Southern Medical UniversityGuangzhou 510515Guangdong ProvinceChina Department of Gastroenterology and Hepatology Guangdong Provincial People’s HospitalGuangzhou 510080Guangdong ProvinceChina

Per-oral endoscopic myotomy(POEM)is an innovative minimally invasive technique and has emerged as the preferred modality for treating achalasia and spastic esophageal disorders in numerous specialized centers *** reflux(GER)is a common complication following POEM ***,an article in the World Journal of Gastroenterology,providing a comprehensive update on post-POEM *** this article,the authors present novel insights and strategies that offer valuable implications for endoscopy.

关键词： Per-oral endoscopic myotomy Gastroesophageal reflux Progress Treatment Update

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