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139 results on '"Lin, Changhong"'

10. High PSR capacitor‐less LDO with adaptive bulk‐driven feedforward technique.

Author

Lin, Changhong, Chen, Zhijian, Tang, Xian, Lin, Xiaoling, and Zheng, Yanqi

Abstract

This article presents a capacitor‐less low dropout (LDO) regulator with a high power supply rejection (PSR) for system‐on‐chip (SoC) applications. With the proposed adaptive bulk‐driven feedforward (ABDFF) technique, in which the ripples are injected adaptively to the bulk of power transistor, the LDO maintains a steady PSR enhancement in wide load conditions, and a lower quiescent current and faster load transient response are realized. Post‐layout simulation results show that the proposed LDO regulator achieves −75‐dB PSR at 1 MHz from 1 to 100 mA and 60‐fs figure of merit (FoM) with a 100‐pF load capacitor. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Tribological Properties of Hard TiB 2 Thin Films Prepared at Low Temperatures Using HiPIMS.

Author

Yu, Jianjian, Zhang, Ping, Ying, Puyou, Lin, Changhong, Yang, Tao, Wu, Jianbo, Li, Chen, Huang, Min, and Levchenko, Vladimir

Subjects
THIN films, FRETTING corrosion, METALS at low temperatures, LOW temperatures, MAGNETRON sputtering, MECHANICAL wear
Abstract

Magnetron-sputtered WS2 composite thin films are solid lubricants with excellent performances. However, the low hardness of the WS2 thin films necessitates the further improvement of their wear resistance. For this purpose, an effective strategy is to alternately deposit or code posit WS2 and a hard phase, such as TiB2, to form hard lubricant thin films. Herein, a TiB2 thin film was prepared under the same conditions as those used for depositing the WS2 thin film with a dense structure and excellent tribological properties. Because of the high deposition energy of high-power impulse magnetron sputtering (HiPIMS), the TiB2 thin film possesses a dense structure and leather-like flat surface (hardness = 24.17 GPa). The friction coefficient of the film under different loads ranges between 0.6 and 0.8. The wear rate of the thin film increases with load, mainly because of fatigue wear and abrasive wear. Under high loads, obvious furrow-like wear marks are observed. At different sliding frequencies, except 8 Hz, the friction coefficient of the film ranges from 0.6 to 0.8. The main wear mode is fatigue wear, particularly at increasing sliding frequencies. Although the film possesses a relatively high friction coefficient, its wear resistance is excellent (minimum wear rate = 1.96 × 10−6 mm3/(N·m)). [ABSTRACT FROM AUTHOR]

Published
2024
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28. Polyurethane/MoS2 composites: gas barrier, hygrothermal aging and recycling.

Author

Huo, Yanqiu, Lin, Changhong, Ge, Huan, Ying, Puyou, Huang, Min, Zhang, Ping, Yang, Tao, Wang, Tianle, Wu, Jianbo, Yan, Yusi, and Levchenko, Vladimir

Subjects
*MOLYBDENUM disulfide, *TANNINS, *SONICATION, *GASES
Abstract

In this work, the Polyurethane/MoS2 composites (PUM) filled with different amount of modified molybdenum disulfide (MoS2) were prepared by solution-blending-casting method. The thermal reversible Diels–Alder (DA) bonds enabled the polymer system recyclable ability. The modified MoS2 were obtained by tannic acid (TA) assistant ultra-sonication exfoliation method were used to improve the gas barrier performance of materials. Compared with the pure PU, about twofold decrease in oxygen gas permeability of PUM composites (from 6719 to 3927 cm3/m2˙d˙Pa) were obtained with 1 wt% MoS2. More important, the samples showed excellent gas barrier and mechanical properties before and after being hygrothermal aged for 100 h. The PUM composites had good gas barrier and recyclability and had great potential application prospects in packing materials. [ABSTRACT FROM AUTHOR]

Published
2023
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41. Processable and recyclable polyurethane/HNTs@Fe3O4 solid–solid phase change materials with excellent thermal conductivity for thermal energy storage.

Author

Lin, Changhong, Ying, Puyou, Huang, Min, Zhang, Ping, Yang, Tao, Liu, Gang, Wu, Jianbo, and Levchenko, Vladimir

Subjects
*THERMAL conductivity, *HEAT storage, *IRON oxide nanoparticles, *PROBLEM solving, *PHASE change materials, *THERMAL properties, *PHASE transitions
Abstract

The permanently chemically cross‐linking solid–solid phase change materials (SSPCMs) were designed to solve the problem of leakage and poor shape stability during the whole process of phase transformation. However, these materials lead to environment pollution and resources waste because of the non‐recyclability. Therefore, a SSPCMs was fabricated using dynamic thermal reversible Diels–Alder bonds. The prepared SSPCMs exhibited excellent shape, heat storage stability, and reliability and reprocessed ability, resulting from dynamic Diels–Alder bonds. Moreover, the Halloysite nanotubes decorated with Fe3O4 nanoparticles (HNTs@Fe3O4) were used to enhance the thermal conductivity of SSPCMs. When the filler content was 0.5 wt%, the best integrated properties (phase change properties and thermal conductivity) of the SSPCMs were obtained, it had the highest melting and freezing phase change enthalpies about 116.8 and 127.2 J/g, and thermal conductivity value, 0.223 W/m K, which was 101% higher than pure SSPCMs. Hence, the prepared SSPCMs can be considered as promising save‐energy, friendly‐environment thermal management materials. [ABSTRACT FROM AUTHOR]

Published
2021
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45. A powered ankle prothesis driven by EHA technique

Author

Fang Jing, Shaoping Wang, Lin Changhong, Li Rufei, and Xingjian Wang

Subjects
0209 industrial biotechnology, Computer science, Hydraulic circuit, 02 engineering and technology, Ankle prosthesis, DC motor, 020901 industrial engineering & automation, medicine.anatomical_structure, 0202 electrical engineering, electronic engineering, information engineering, Plunger pump, medicine, Solenoid valve, Torque, 020201 artificial intelligence & image processing, Hydraulic machinery, Ankle, Actuator, Simulation
Abstract

There are many limitations in passive ankle prosthesis which are widely used so far. Meanwhile succeed commercial product has not been push out yet although the study of powered ankle prosthesis is ongoing. One of the main reason is that it is difficult to integrate the mechanism with limited weight, which have enough instantaneous power to promote the body forward. In this paper, a powered ankle prosthesis driven by EHA (Electro-Hydraulic Actuator) technique is proposed to solve this problem. It is mainly composed of peripheral mechanism and embedded hydraulic system which contains accumulator, plunger pump, motor, solenoid valve, miniature hydraulic circuit. The prototype with this structure is similar in quality and volume to a real ankle and is verified to match the true ankle performance.

Published
2018

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