Two-Dimensional Unilamellar Cation-Deficient Metal Oxide Nanosheet Superlattices for High-Rate Sodium Ion Energy Storage

Xiong, Pan,Zhang, Xiuyun,Zhang, Fan,Yi, Ding,Zhang, Jinqiang,Sun, Bing,Tian, Huajun,Shanmukaraj, Devaraj,Rojo, Teofilo,Armand, Michel,Ma, Renzhi,Sasaki, Takayoshi,Wang, Guoxiu American Chemical Society 2018 ACS NANO Vol.12 No.12

<P>Cation-deficient two-dimensional (2D) materials, especially atomically thin nanosheets, are highly promising electrode materials for electrochemical energy storage that undergo metal ion insertion reactions, yet they have rarely been achieved thus far. Here, we report a Ti-deficient 2D unilamellar lepidocrocite-type titanium oxide (Ti<SUB>0.87</SUB>O<SUB>2</SUB>) nanosheet superlattice for sodium storage. The superlattice composed of alternately restacked defective Ti<SUB>0.87</SUB>O<SUB>2</SUB> and nitrogen-doped graphene monolayers exhibits an outstanding capacity of ∼490 mA h g<SUP>-1</SUP> at 0.1 A g<SUP>-1</SUP>, an ultralong cycle life of more than 10000 cycles with ∼0.00058% capacity decay per cycle, and especially superior low-temperature performance (100 mA h g<SUP>-1</SUP> at 12.8 A g<SUP>-1</SUP> and −5 °C), presenting the best reported performance to date. A reversible Na<SUP>+</SUP> ion intercalation mechanism without phase and structural change is verified by first-principles calculations and kinetics analysis. These results herald a promising strategy to utilize defective 2D materials for advanced energy storage applications.</P> [FIG OMISSION]</BR>

On the fuzzy-adaptive command filtered backstepping control of an underactuated autonomous underwater vehicle in the three-dimensional space

JinQiang Wang,Cong Wang,Yingjie Wei,ChengJu Zhang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6

This paper studies the three-dimensional path following control problem for an underactuated autonomous underwater vehicle in the presence of parameter uncertainties and external disturbances. Firstly, an appropriate model for the error dynamics was established to solve the path following problem in a moving Serret-Frenet frame. Secondly, an adaptive robust control scheme is proposed through fuzzy logic theory, command filtered backstepping method and an adaptation mechanism. Finally, a suitable Lyapunov candidate function is utilized to verify the stability of the overall control system and demonstrate uniform ultimate boundedness of path following errors. Following novelties are highlighted in this study: (i) The fuzzy method is adopted to solve the problems of model uncertainties, which makes the controller more practical; (ii) to calculate the virtual control derivative, a second-order filter is designed. This reduces the computational effort of the standard backstepping technique. Moreover, the effect of high frequency measurement noise is considerably attenuated via an appropriate filter to attain a more robust control system. (iii) To attain a desired approximation accuracy between the virtual control and the filtered signals, a compensation loop containing the filtered error is established. (iv) An anti-windup design is proposed to solve the problem of integral saturation in control input signals. Finally, comparative simulations are performed to ensure that the presented control scheme has excellent following accuracy and good robustness under multiple uncertainties and external disturbances.

Neural network adaptive position tracking control of underactuated autonomous surface vehicle

ChengJu Zhang,Cong Wang,Yingjie Wei,JinQiang Wang 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.2

The present study investigates the position tracking control of the underactuated autonomous surface vehicle, which is subjected to parameters uncertainties and external disturbances. In this regard, the backstepping method, neural network, dynamic surface control and the sliding mode method are employed to design an adaptive robust controller. Moreover, a Lyapunov synthesis is utilized to verify the stability of the closed-loop control system. Following innovations are highlighted in this study: (i) The derivatives of the virtual control signals are obtained through the dynamic surface control, which overcomes the computational complexities of the conventional backstepping method. (ii) The designed controller can be easily applied in practical applications with no requirement to employ the neural network and state predictors to obtain model parameters. (iii) The prediction errors are combined with position tracking errors to construct the neural network updating laws, which improves the adaptation and the tracking performance. The simulation results demonstrate the effectiveness of the proposed position tracking controller.

Inhibition of miR338 rescues cleidocranial dysplasia in Runx2 mutant mice partially via the Hif1a-Vegfa axis

Jin Runze,Zhang Hanshu,Lin Chujiao,Guo Jinqiang,Zou Weiguo,Zhi Chen,Liu Huan 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-

Haploinsufficiency of Runt-related transcription factor-2 (RUNX2) is responsible for cleidocranial dysplasia (CCD), a rare hereditary disease with a range of defects, including delayed closure of the cranial sutures and short stature. Symptom-based treatments, such as a combined surgical-orthodontic approach, are commonly used to treat CCD patients. However, there have been few reports of treatments based on Runx2-specific regulation targeting dwarfism symptoms. Previously, we found that the miR338 cluster, a potential diagnostic and therapeutic target for postmenopausal osteoporosis, could directly target Runx2 during osteoblast differentiation in vitro. Here, we generated miR338−/−;Runx2+/− mice to investigate whether inhibition of miR338 could rescue CCD defects caused by Runx2 mutation in vivo. We found that the dwarfism phenotype caused by Runx2 haploinsufficiency was recovered in miR338−/−;Runx2+/− mice, with complete bone density restoration and quicker closure of fontanels. Single-cell RNA-seq analysis revealed that knockout of miR338 specifically rescued the osteoblast lineage priming ability of bone marrow stromal cells in Runx2+/− femurs, which was further confirmed by Osterix-specific conditional knockout of miR338 in Runx2+/− mice (OsxCre; miR338 fl/fl;Runx2+/−). Mechanistically, ablation of the miR338 cluster in Runx2+/− femurs directly rescued the Hif1a-Vegfa pathway in Runx2+/− osteoblasts, as proven by gene expression profiles and ChIP and Re-ChIP assays. Collectively, our data revealed the genetic interaction between Runx2 and the miR338 cluster during osteoblast differentiation and implied that the miR338 cluster could be a potential therapeutic target for CCD.

Superposition of structures in the Sichuan‒Yunnan N-S tectonic belt at the eastern margin of the Tibetan Plateau: constraints from structures and magnetic fabrics

Yingtao Chen,Guowei Zhang,Rukui Lu,Jinqiang Xie 한국지질과학협의회 2015 Geosciences Journal Vol.19 No.2

In this study on the northern section of the Sichuan– Yunnan tectonic belt (SYNSTB), which is on the eastern margin of the Tibetan Plateau, we assess the characteristics of superposed structures in the Daliang–Shan and Hanyuan–Ganluo fault belts, as well as in the Ganluo Basin that lies between them. By integrating field observations of structures with an analysis of magnetic fabrics, we show that the northern section of the SYNSTB underwent two episodes of deformation during the Mesozoic–Cenozoic. The first episode was characterized by NE-SW shortening that was initiated in the Late Jurassic–Late Cretaceous, and it may be related to the clockwise rotation of Yangtze Block and the far field effect of the Neo-Tethys ocean basin closed; and the second by NW-SE compressional shearing that was initiated in the Miocene–Pliocene and continues to the present day, and it is the result of the eastern extrusion of the Tibetan Plateau material. The magnetic fabrics associated with the weak deformation of the Ganluo Basin are mainly the result of layer-parallel shortening before folding, which is inferred to indicate Mesozoic NE-SW compression. In addition, the following atypical magnetic fabrics are present: (1) a magnetic foliation that is oblique to the bedding and associated with layerparallel simple shearing during folding, and (2) a magnetic lineation that is oblique to the strike of bedding to varying degrees, and that is the result of two superposed structures. The integrated study of field structures and magnetic fabrics indicates, therefore, that the N-S structures of the SYNSTB were mainly developed in the Mesozoic, but were subsequently overprinted by left-lateral strike-slip shearing during the Cenozoic. The resulting composite tectonic system provides further information on the tectonic evolution of the eastern margin of the Tibetan Plateau during the Mesozoic and Cenozoic.

Optimization of thermal buckling control for composite laminates with PFRC actuators using trigonometric shear deformation theory

Yu Xue,Yao Zhang,Jinqiang Li 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.1

This work aims to explore optimal design and control of thermal buckling for composite laminates with piezoelectric fiber reinforced composite (PFRC) actuators. Fourvariable trigonometric shear deformation theory without introduction of a shear correction factor is used in the structural modeling. The high accuracy of the present approach is examined by analyzing the critical buckling temperature and natural frequency compared with references results. A temperature feedback control approach is proposed in designing the controller. Taking fiber angle as the optimization design variable, layerwise optimization approach (LOA) is applied to maximize critical buckling temperature of piezolaminated plate and a set of stacking sequences are obtained. The resulting analysis demonstrates that the proposed control approach can clearly increase the critical buckling temperature of piezo-laminated plates. The optimization process developed is useful in devising stacking sequences for the piezo-laminated structures in thermal environments.

Multi‑condition dynamic model control strategy of the direct drive motor of electric vehicles based on PIO–LightGBM algorithm

Fang Xie,Wenyu Zhang,Mengyuan Shen,Jinqiang Zhang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.3

Permanent magnet synchronous motor (PMSM) is widely used in new energy vehicles. At present, to make electric vehicles have a wider speed range, the motor can reach the rated speed above through the field-weakening control. However, when the traditional field-weakening control strategy is above the rated speed, the dynamic response ability of the vehicle declines. Problems such as torque oscillation and current jump occur. To solve these problems, based on a pigeon-inspired optimization (PIO) algorithm and optimized light gradient boosting machine (LightGBM), the dynamic response capability of the permanent magnet synchronous motor is improved. The robust adaptability of the control system to disturbances and parameter changes is also further improved. By collecting experimental data, the importance of relevant variables is analyzed, and the variable with the largest weight is selected as the input of the model. PIO is used to optimize LightGBM, and the loss function is optimized. Finally, the regression model is established. Simulation and experimental results show that the method is effective.

Antimonene prepared by laser irradiation applied for nonlinear optical limiting

Weili Shen,Jinning Hu,Teng Ma,Jiaxin Wang,Yi Wei,Yuanzhou Zhang,Jinqiang Wu,Jun Chen 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.6

Antimonene, a novel two-dimension (2D) Group-VA material, shows excellent electrical and optical properties. In this work,antimonene nanosheets or nanoparticles were obtained by laser irradiating antimony powder in isopropanol solution anddiff erent morphology of antimonene were obtained by adjusting diff erent laser irradiation parameters, including irradiationtime and irradiation energy. The nonlinear absorption properties of antimonene with diff erent morphologies under 532 nmnanosecond laser were studied by Z-scan technology. It was found that the reverse-saturation absorption ability was thestrongest when the morphology of the sample was nanosheets, which was very suitable for optical limiting. In addition, dueto the limitation of the application of the sample in the form of solution, we added it into organosilicon, and obtained thesolid antimonene-organosilicon composite with optical limiting function. The results showed that antimonene nanosheetswith best optical limiting ability can be prepared by adjusting the laser irradiation parameters, and the products are successfullyadded into solid matrix to enhance its practicability in protecting people’s eyes and optical equipment from damagecaused by high power laser.