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Gradient‑Layered MXene/Hollow Lignin Nanospheres Architecture Design for Flexible and Stretchable Supercapacitors

Nano-Micro Letters 2025年第2期17卷 447-462页

作者： haonan Zhang Cheng hao Tongtong Fu Dian Yu Jane Howe Kaiwen Chen ning yan.hao ren Huamin Zhai Jiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass Materials NanJing Forestry UniversityNanjing 210037People’s Republic of China Department of Chemical Engineering and Applied Chemistry University of Toronto200 College StreetTorontoON M5S 3E5Canada Department of Materials Science and Engineering University of Toronto184 College StreetTorontoON M5S 3E4Canada College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China

With the rapid development of flexible wearable electronics,the demand for stretchable energy storage devices has *** this work,a novel gradient-layered architecture was design based on single-pore hollow lignin nanospheres(HLNPs)-intercalated two-dimensional transition metal carbide(Ti_(3)C_(2)T_(x) MXene)for fabricating highly stretchable and durable *** depositing and inserting HLNPs in the MXene layers with a bottom-up decreasing gradient,a multilayered porous MXene structure with smooth ion channels was constructed by reducing the overstacking of MXene ***,the micro-chamber architecture of thin-walled lignin nanospheres effectively extended the contact area between lignin and MXene to improve ion and electron accessibility,thus better utilizing the pseudocapacitive property of *** these strategies effectively enhanced the capacitive performance of the *** addition,HLNPs,which acted as a protective phase for MXene layer,enhanced mechanical properties of the wrinkled stretchable electrodes by releasing stress through slip and deformation during the stretch-release cycling and greatly improved the structural integrity and capacitive stability of the *** electrodes and symmetric flexible all-solid-state supercapacitors capable of enduring 600%uniaxial tensile strain were developed with high specific capacitances of 1273 mF cm^(−2)(241 F g^(−1))and 514 mF cm^(−2)(95 F g^(−1)),***,their capacitances were well preserved after 1000 times of 600%stretch-release *** study showcased new possibilities of incorporating biobased lignin nanospheres in energy storage devices to fabricate stretchable devices leveraging synergies among various two-dimensional nanomaterials.

关键词： Hollow lignin nanospheres MXene Gradient-layered architecture Wrinkled electrodes Stretchable supercapacitors

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Sphalerite/silica interaction:Zeta potential distribution measurement

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Rare Metals 2016年第9期35卷 729-734页

作者： hao ren Meng-Qi ren Zhen Li Jing ning Yu-Fen Zhang Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong School of Chemistry and Chemical EngineeringUniversity of Jinan School of Chemical Engineering and Technology Tianjin University

An appropriate measurement is needed to control the calcium ion content and reduce the interaction among fine mineral *** this paper,the sphalerite/silica interactions were studied by Zeta potential measurements and a novel Zeta potential distribution（ZPD）measurement method in different concentrations of calcium ion *** study mineral surface molecular and atomic absorption states,energy dispersive spectroscopy（EDS） and scanning electron microscope（SEM） were *** reagent adsorbed on the mineral surface was analyzed by the interactions *** results show that adsorption of flotation reagent is not conducive when the calcium ion concentration is high in the *** the calcium ion concentration is the effective method to reduce particle interactions in the *** specific method is that the appropriate amount of sodium carbonate is added into the gypsum-supersaturated *** minerals＇ interactions can be interpreted by measuring ZPD.

关键词： Sphalerite Silica Interaction Zeta potential distribution Flotation reagent

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A Practical Approach for Missing Wireless Sensor Networks Data Recovery

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China Communications 2024年第5期21卷 202-217页

作者： Song Xiaoxiang Guo yan Li ning ren Bing The College of Communications Engineering Army Engineering University of PLANanjing 210007China The 63891 Unit of PLA Luoyang 471000China

In wireless sensor networks(WSNs),the performance of related applications is highly dependent on the quality of data ***,missing data is almost inevitable in the process of data acquisition and *** methods often rely on prior information such as low-rank characteristics or spatiotemporal correlation when recovering missing WSNs ***,in realistic application scenarios,it is very difficult to obtain these prior information from incomplete data ***,we aim to recover the missing WSNs data effectively while getting rid of the perplexity of prior *** designing the corresponding measurement matrix that can capture the position of missing data and sparse representation matrix,a compressive sensing(CS)based missing data recovery model is ***,we design a comparison standard to select the best sparse representation basis and introduce average cross-correlation to examine the rationality of the established ***,an improved fast matching pursuit algorithm is proposed to solve the *** results show that the proposed method can effectively recover the missing WSNs data.

关键词： average cross correlation matching pursuit missing data wireless sensor networks

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Analysis of the Internal Characteristics of a De ector Jet Servo Valve

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Chinese Journal of Mechanical Engineering 2019年第2期32卷 180-192页

作者： hao yan Yukai ren Lei Yao Lijing Dong School of Mechanical Electronic and Control Engineering Beijing Jiaotong University

In current research on deflector jet servo valves, the receiver pressure estimated using traditional two-dimensional simulation and theoretical calculation is always lower than the experimental data; therefore, credible information about the flow field in the prestage part of the valve can hardly be obtained. To investigate this issue and understand the internal characteristics of the deflector jet valve, a realistic numerical model is constructed and a three-dimensional simulation carried out that displays a complex flow pattern in the deflector jet structure. Then six phases of the flow pattern are presented, and the defects of the two-dimensional simulation are revealed. Based on the simulation results, it is found that the jet in the deflector has a longer core area and the fluid near the shunt wedge cannot resist the impact of the high-speed fluid. Therefore, two assumptions about the flow distribution are presented by which to construct a more complete theoretical model. The receiver pressure and prestage pressure gain are significantly enhanced in the calculations. Finally, special experiments on the prestage of the servo valve are performed, and the pressure performance of the numerical simulation and the theoretical calculation agree well with the experimental data. Finally, the internal mechanism described by the theoretical and numerical models is verified. From this research,more accurate numerical and theoretical models are proposed by which to figure out the internal characteristics of the deflector jet valve.

关键词： Deflector jet Servo valve Computational fluid dynamics(CFD) Numerical simulation

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Kinship analysis reveals reproductive success skewed toward overwintered Brandt’s voles in semi-natural enclosures

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Integrative Zoology 2019年第5期14卷 435-445页

作者： yan CHEN Dawei WANG ning LI Xiangfa HU Fei ren Weili hao Ying SONG Xiaohui LIU State Key Laboratory for Biology of Plant Disease and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina College of Life Sciences Sichuan UniversityChengduChina

Age structure and seasonality influence the population fluctuations of small *** determines body weight and social experience,while seasonality regulates the duration of the breeding season and onset of sexual maturity in newborn ***,reproductive success and skew usually occur in different age ***’s vole(Lasiopodomys brandtii)is a social,short-lived and seasonal breeding small rodent with a dramatic seasonal population fluctuation,but reproductive skew is not fully understood in this *** the present study,we determined kinship in semi-natural enclosure populations using microsatellite markers based on genotyping,analyzed the reproductive skew between sexes and between overwintered and newborn voles,and monitored variation in male reproductive activity by testing fecal testosterone levels throughout the *** voles had the most reproductive success along with a striking increase in the population size in the enclosures,with all biological fathers and 77.8%of biological mothers,which had 100%and 87%of the total offspring,*** to overwintered voles,reproductive skews were significantly higher in potential overwintered and newborn parents,implying the possible reproductive suppression of newborn voles by dominant overwintered ***,both heavier body weight and higher testosterone levels in overwintered males supported their potential social status in the *** study provided new evidence for reproductive skew and differentiation of postnatal gonadal development patterns of different age groups in Brandt’s vole.

关键词： Brandt’s vole microsatellite marker reproductive skew social dominance testosterone

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A simplified decoding algorithm for multi-CRC polar codes

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Journal of Systems Engineering and Electronics 2020年第1期31卷 12-18页

作者： yanG Haifen yan Suxin ZHANG hao ren yan HU Xiangdong LIN Shuisheng School of Information and Communication Engineering University of Electronic Science and Technology of China

Polar codes represent one of the major breakthroughs in 5G standard,and have been proven to be able to achieve the symmetric capacity of binary-input discrete memoryless channels using the successive cancellation list(SCL)decoding ***,the SCL algorithm suffers from a large amount of memory *** paper proposes an adaptive simplified decoding algorithm for multiple cyclic redundancy check(CRC)polar *** results show that the proposed method can reduce the decoding complexity and memory *** can also acquire the performance gain in the low signal to noise ratio region.

关键词： polar code successive cancellation list(SCL) cyclic redundancy check(CRC) adaptive decoding

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Porosity and mechanical properties of porous titanium fabricated by gelcasting

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Rare Metals 2008年第3期27卷 282-286页

作者： LI yan GUO Zhimeng hao Junjie ren Shubin School of Materials Science and Engineering University of Science and Technology Belting Beifing 100083 China

Porous Ti compacts with large size and complex shape for biomedical applications were fabricated in the porosity range from 40.5% to 53.8% by controlling gelcasting parameters and sintering conditions. The experimental results show that the total porosity and open porosity of porous titanium compacts gelcast from the Ti slurry with 34 vol.% solid loading and sintered at 1100℃ for 1.5 h are 46.5% and 40.7%, respectively, and the mechanical properties are as follows： compressive strength 158.6 MPa and Young＇s modulus 8.5 GPa, which are similar to those of human cortical bone and appropriate for implanting purpose.

关键词： titanium porous materials gelcasting porosity mechanical properties

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The Weyl’s Theorem and Its Perturbations in Semisimple Banach Algebra

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Acta Mathematica Sinica,English Series 2021年第5期37卷 675-688页

作者： Ying Ying KONG Li ning JIANG yan Xun ren School of Mathematics and Statistics Beijing Institute of TechnologyBeijing 100081P.R.China

Denote a semisimple Banach algebra with an identity e by *** paper studies the Fredholm,Weyl and Browder spectral theories in a semisimple Banach algebra,and meanwhile considers the properties of the Fredholm element,the Weyl element and the Browder ***,for a∈A,we give the Weyl’s theorem and the Browder’s theorem for a,and characterize necessary and sufficient conditions that both a and f(a)satisfy the Weyl’s theorem or the Browder’s theorem,where f is a complex-valued function analytic on a neighborhood ofσ(a).In addition,the perturbations of the Weyl’s theorem and the Browder’s theorem are investigated.

关键词： Semisimple Banach algebra Fredholm element Browder element Weyl’s theorem perturbation

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Weather Induced Quasi-Periodic Motions in Estuaries and Bays:Meteoro-logical Tide

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China Ocean Engineering 2020年第3期34卷 299-313页

作者： LI Chun-yan HUANG Wei WU ren-hao Alex SHEREMET College of the Coast and Environment Louisiana State UniversityBaton Rouge 70803USA Virginia Institute of Marine Science College of William and MaryGloucester Pt.23062USA School of Atmospheric Sciences Sun Yat-Sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Engineering School of Sustainable Infrastructure and Environment University of FloridaGainesville FL 32611USA

Influenced by weather, the estuaries and bays often exhibit recurring oscillations in flow and water level similar to astronomical tides. The weather impact however is less regular than tides and more difficult to predict. The spectrum of weather induced motions in estuaries and bays is mostly at the low-frequency end with time scales longer than those of diurnal tides. The repeated weather impact produces meteorological tide: the recurring flood and ebb and flushing of the estuaries and bays but at lower frequencies than those of tides. The variation in weather conditions is quasi-periodic and of large scale nature(~1000-3000 km) because of the alternating low-and high-atmospheric pressure systems of extra-tropical cyclones and anti-cyclones and associated fronts. By examining 40 years of data between Jan. 1, 1977 and Dec. 31, 2016, we identified 1648 frontal events(averaging ~41.2±4.7 per year)influencing the northern Gulf of Mexico for time periods in the spring, fall and winter. The late spring and summer months(May, Jun, July, and August) were not included in the calculation because of much weaker activities involving synoptic weather systems with fronts during these months. It is found that the number of frontal events reached the maximum in Jan. and Dec. while the minimum occurred in April and Sept. It is found that there is an increasing trend of number of fronts over the 40-year period. Our data show that the low pass filtered water level,velocity, and vorticity(velocity shear) all vary in response to the weather and appear as the meteorological tide. The particle excursions of meteorological tides are much larger than those from the astronomical tides. In addition, the irregular nature of the meteorological tide makes the inward flux and outward flux asymmetric in general and thus it has a significant implication to dispersion and transport of waterborne materials. A scaling analysis shows that the meteorological tide generally reaches quasi-steady state;a

关键词： meteorological tide atmospheric fronts particle excursion quasi-steady state northern Gulf of Mexico estuarine exchange flows

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Three-dimensional orbit and physical parameters of HD 6840

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Research in Astronomy and Astrophysics 2016年第2期16卷 113-118页

作者： Xiao-Li Wang Shu-Lin ren yan-ning Fu Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China

HD 6840 is a double-lined visual binary with an orbital period of N7.5 years. By fitting the speckle interferometric measurements made by the 6 m BTA telescope and 3.5 m WIYN telescope, Balega et al. gave a preliminary astrometric orbital solution of the system in 2006. Recently, Griffin derived a precise spectroscopic orbital solution from radial velocities observed with OPH and Cambridge Coravel. However, due to the low precision of the determined orbital inclination, the derived component masses are not satisfying. By adding the newly collected astrometric data in the Fourth Catalog of Interferometric Measurements of Binary Stars, we give a three-dimensional orbit solution with high precision and derive the preliminary physical parameters of HD 6840 via a simultaneous fit including both astrometric and radial velocity measurements.

关键词： binaries spectroscopic -- astrometry -- stars fundamental parameters -- stars individual (HD 6840)

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