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Nitrogen-,phosphorus-doped carbon-carbon nanotube CoP dodecahedra by controlling zinc content for high-performance electrocatalytic oxygen evolution

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Rare Metals 2020年第6期39卷 680-687页

作者： xia-xia Li Pei-Yao Zhu Qing Li Yu-xia Xu Yan Zhao huan Pang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Guangling College Yangzhou UniversityYangzhou 225000China College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China

Here,N-and P-doped carbon-carbon nanotube CoP(NPC-CNTs-CoP)nanoparticles dodecahedra are achieved by multistep calcination of the Zn-doped zeolitic imidazolate framework ZIF-67 precursor(ZnCo-ZIF).In the structures,the presence of N and P atoms,abundant CNTs and the CoP nanoparticles can enhance electrochemical activity and promote the structural stability of *** the temperature increases,the Zn contents gradually reduce to zero,which provides more active sites for electrochemical ***,the high specific surface area and microporous behavior of NPC-CNTsCoP-9 make it excellent in electrocatalytic ***-CoP-9 shows a low overpotential of 224 mV at10 mA·cm^-2 in 1.0 mol·L^-1 KOH *** strategy of zeolitic imidazole framework-derived transition metal phosphides will provide a new sight for developing energy conversion materials.

关键词： Nitrogen Phosphorus Carbon Carbon nanotube CoP Oxygen evolution

Fuzzy PID Control of Space Manipulator for Both Ground Alignment and Space Applications

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International Journal of Automation and computing 2014年第4期11卷 353-360页

作者： Fu-Cai Liu Li-huan Liang juan-juan Gao Key Lab of Industrial Computer Control of Hebei Province Yanshan University

Considering gravity change from ground alignment to space applications, a fuzzy proportional-integral-differential(PID)control strategy is proposed to make the space manipulator track the desired trajectories in different gravity environments. The fuzzy PID controller is developed by combining the fuzzy approach with the PID control method, and the parameters of the PID controller can be adjusted on line based on the ability of the fuzzy controller. Simulations using the dynamic model of the space manipulator have shown the effectiveness of the algorithm in the trajectory tracking problem. Compared with the results of conventional PID control,the control performance of the fuzzy PID is more effective for manipulator trajectory control.

关键词： Space manipulator trajectory tracking ground alignment space applications fuzzy proportional-integral-differential (PID) gravity environment

Early human occupation of the Tibetan Plateau

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Science Bulletin 2018年第24期63卷 1598-1600页

作者： Dongju Zhang huan xia Fahu Chen Key Laboratory of Western China's Environmental Systems (Ministry of Education) College of Earth Environmental SciencesLanzhou University Key Laboratory of Alpine Ecology (LAE) CAS Center for Excellence in Tibetan Plateau Earth System SciencesInstitute of Tibetan Plateau ResearchChinese Academy of Sciences

The Tibetan Plateau,the world's "Third Pole",has an average elevation above 4,000 masl (meters above sea level)and an area of over 500×10^4km^2,It is the highest and largest plateau on earth and is very sensitive to global climate change [1,2].The cold,dry and hypoxic high-altitude environment of the plateau presents a major challenge to human ***,the history and mechanisms of prehistoric human history on the Tibetan Plateau-from brief hunting expeditions to seasonal hunting-gathering and finally to permanent settlements-has attracted both general interest and substantial scientific debates [3-6].Archaeological studies indicate that humans probably first explored the plateau at the end of the late *** practiced intensive seasonal hunting-gathering from 15 ka BP [6],and permanently settled regions above 3,000 masl after 3.6 ka BP,which was facilitated by the development of an agropastoral economy [3].However, the early part of the human history of the Tibetan Plateau is still poorly documented,due to the lack of well-preserved archaeological sites and reliable dating results (***).

关键词： The Tibetan Plateau average elevation human history

Improved RIP-based performance guarantees for multipath matching pursuit

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Science China(Information Sciences) 2018年第10期61卷 173-186页

作者： juan ZHAO xia BAI Ran TAO School of Information and Electronics Beijing Institute of Technology Beijing Key Laboratory of Fractional Signals and Systems Beijing Institute of Technology

The multipath matching pursuit(MMP) is a generalization of the orthogonal matching pursuit(OMP), which generates multiple child paths for every candidate in each iteration and selects the candidate having the minimal residual as the final support set when iteration ends. In this paper we analyze its performance in both noiseless and noisy cases. The restricted isometry property(RIP)-based condition of MMP that ensures accurate recovery of sparse signals in the noiseless case is derived by using a simple technique. The performance guarantees of the MMP for support recovery in noisy cases are also *** is shown that under certain conditions on the RIP and minimum magnitude of nonzero components of the sparse signal, the MMP will exactly recover the true support of the sparse signal in cases of bounded noises and recover the true support with a high probability in the case of Gaussian noise. Our bounds on the RIP improve the existing results.

关键词： compressed sensing(CS) sparse signal reconstruction multipath matching pursuit(MMP) support recovery restricted isometry property(RIP)

Clinical characteristics and ABCC2 genotype in Dubin-Johnson syndrome:A case report and review of the literature

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World Journal of Clinical Cases 2021年第4期9卷 878-885页

作者： huan Wu Xue-Ke Zhao juan-juan Zhu Department of Infectious Diseases The Affiliated Hospital of Guizhou Medical UniversityGuiyang 550001Guizhou ProvinceChina

BACKGROUND Dubin-Johnson syndrome(DJS)is a benign autosomal recessive liver disease involving mutations of the ABCC2 *** is characterized by chronic or intermittent conjugated hyperbilirubinemia,with chronic idiopathic jaundice as the main clinical *** alterations of the ABCC2 gene are commonly used for diagnosing DJS;however,the causative ABCC2 point mutation in Chinese patients remains *** on ABCC2 mutations in Chinese DJS patients is extremely rare,and the diagnosis of DJS remains *** routine analysis of ABCC2 mutations is helpful for the diagnosis of ***,we report the clinical characteristics and ABCC2 genotype of an adult female DJS *** article is to expound the discovery of more potentially pathogenic ABCC2 variants will that contribute to DJS *** SUMMARY This study investigated a woman referred for DJS and involved clinical and genetic ***2 mutations were identified by next-generation sequencing(NGS).The patient showed intermittent jaundice and conjugated *** examinations were consistent with the typical phenotype of *** diagnostic analysis revealed an ABCC2 genotype exhibiting a pathogenic variant,namely c.2443C>T(***815*),which has not been reported previously in the domestic or foreign *** Pathogenic ABCC2 mutations play an important role in the diagnosis of DJS,especially in patients with atypical ***,NGS is used in the routine analysis of DJS cases and such tests of further cases will better illuminate the relationship between various genotypes and phenotypes of DJS.

关键词： Dubin-Johnson syndrome ABCC2 genotype Next-generation sequencing ABCC2 mutation Homozygous mutation Case report

Dynamics and response reshaping of nonlinear predator-prey system undergoing random abrupt disturbances

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Applied Mathematics and Mechanics(English Edition) 2021年第8期42卷 1123-1134页

作者： Lei xia Jiaojiao SUN Zuguang YING Ronghua huan Weiqiu ZHU Department of Mechanics Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China

An actual ecological predator-prey system often undergoes random environmental mutations owing to the impact of natural disasters and man-made destruction, which may destroy the balance between the species. In this paper,the stochastic dynamics of the nonlinear predator-prey system considering random environmental mutations is investigated, and a feedback control strategy is proposed to reshape the response of the predator-prey system against random abrupt environmental mutations. A delayed Markov jump system(MJS) is established to model such a predator-prey system. A novel first integral is constructed which leads to better approximation solutions of the ecosystem. Then, by applying the stochastic averaging method based on this novel first integral, the stochastic response of the predator-prey system is investigated, and an analytical feedback control is designed to reshape the response of the ecosystem from the disturbed state back to the undisturbed *** simulations finally illustrate the accuracy and effectiveness of the proposed procedure.

关键词： random excitation nonlinear dynamics reshaping control stationary probability density function(SPDF) predator-prey system

Collaborative optimization of screening efficiency and screen surface load-PartⅠ:Modeling and evaluation

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Particuology 2022年第10期20卷 77-87页

作者： Xuhui xia Weimin Jing Zelin Zhang Lei Wang huan Zhang Key Laboratory of Metallurgical Equipment and Control Technology Wuhan University of Science and TechnologyWuhan 430081China

The screen surface load(SSL)caused by granular materials is an important factor affecting the structural performance of vibrating *** on virtual experiment,a multi-objective collaborative optimiza-tion method is proposed to control the SSL under high screening efficiency(SE)in this ***,a DEM model was established to study the influence of process parameters on SE and ***,the NSGA-Ⅱ(Non-dominated Sorting Genetic Algorithm)was employed to optimize the screening parameters with both SE and SSL as *** optimization method proves to be effective implementing on a linear vibrating *** SE equals to 98.5%,the SSL optimizable range is 39.2%.While compromising the SE to 88.7%,the SSL optimizable range improves to 48.6%.The result shows that the collaborative optimization could effectively control the SSL while maintaining a high SE,which is of great significance to improve the service life of screen surface and screen body.

关键词： Vibrating screen Discrete element method Screening efficiency Screen surface load Collaborative optimization

Multiplicity of Solutions for Quasilinear Elliptic Systems with Singularity

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Acta Mathematicae Applicatae Sinica 2015年第1期31卷 277-286页

作者： juan LI Yu-xia TONG Department of Mathematics Ningbo University College of Science Heibei United University

In this paper, we study the existence of multiple solutions for the following quasilinear ellipticsystem：-△pu-μ1︳u︳p-1u/︳x︳=α1up（t）-2/︳x︳t＋β1︳v︳β2︳u︳β1-2u,x∈Ω,-△qu-μ2︳v︳q-2v/︳x︳q=α2 vq（s）-2/︳x︳sv＋β2︳u︳β1︳v︳β2-2v,x∈Ω u（x）=v（x）=0 x∈Ω Multiplicity of solutions for the quasilinear problem is obtained via variational method.

关键词： quasilinear elliptic system singularity critical growth

Study on shock wave-induced cavitation bubbles dissolution process

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Chinese Physics B 2017年第2期26卷 280-287页

作者： huan Xu Peng-Fei Fan Yong Ma xia-Sheng Guo Ping Yang juan Tu Dong Zhang Key Laboratory of Modem Acoustics of the Ministry of Education Nanjing University Nanjing 210093 China National Institute of Metrology Beijing 100029 China Institute of Traumatology and Orthopedics Nanjing University of Chinese Medicine Nanjing 210023 China

This study investigated dissolution processes of cavitation bubbles generated during in vivo shock wave（SW）-induced treatments. Both active cavitation detection（ACD） and the B-mode imaging technique were applied to measure the dissolution procedure of bi Spheres contrast agent bubbles by in vitro experiments. Besides, the simulation of SW-induced cavitation bubbles dissolution behaviors detected by the B-mode imaging system during in vivo SW treatments, including extracorporeal shock wave lithotripsy（ESWL） and extracorporeal shock wave therapy（ESWT）, were carried out based on calculating the integrated scattering cross-section of dissolving gas bubbles with employing gas bubble dissolution equations and Gaussian bubble size distribution. The results showed that（i） B-mode imaging technology is an effective tool to monitor the temporal evolution of cavitation bubbles dissolution procedures after the SW pulses ceased, which is important for evaluation and controlling the cavitation activity generated during subsequent SW treatments within a treatment period;（ii） the characteristics of the bubbles, such as the bubble size distribution and gas diffusion, can be estimated by simulating the experimental data properly.

关键词： bubble cavitation shock wave B-mode imaging residual bubbles bubble dissolution