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Microfabrication of On-Demand Tapered Glass Capillaries by Etching Combined With Polishing

JOURNAL OF MICROELECTROMECHANICAL SYSTEMS 2022年第3期31卷 473-480页

作者： Wei, Chunyang Yu, Chengzhuang Li, Shanshan Meng, Jiyu Li, Tiejun Pan, Feng Wang, Zichao Li, Junwei Hebei Univ Technol Hebei Key Lab Robot Sensing & Human Robot Interac Sch Mech Engn Tianjin 300132 Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equip Tianjin 300130 Peoples R China Jiangnan Univ Jiangsu Key Lab Adv Food Mfg Equipment & Technol Wuxi 214122 Jiangsu Peoples R China Hebei Univ Technol Inst Biophys Sch Hlth Sci & Biomed Engn Tianjin 300401 Peoples R China Hebei Univ Technol Dept Elect & Informat Engn Langfang 065000 Peoples R China

Micro fabrication of tapered glass capillaries with on-demand geometry is one of the essential issues to make specific devices for electrophysiological experiments, microfluidics, pharmaceutics. Capitalizing on chemical etching and mechanical polishing, we have developed a reliable microfabrication method to make tapered glass capillaries with on-demand size. The tip ending diameter reaches from several microns to hundreds of microns within one hour fabrication time, which can meet the requirement for microfabrication of microfluidic devices. To demonstrate the performance of the hybrid microfabrication method, the effect of etching time, and etchant concentrations are proposed. Furthermore, the surface quality of fabricated device is demonstrated to show the advantages of our microfabrication method. Then two typical applications such as the soft manipulation of zebrafish embryo and the production of emulsion droplets are performed. This hybrid microfabrication method of chemical etching combined with mechanical polishing shows great advantages to obtain on-demand size of tapered glass capillaries, and these features make it highly promising for microfabrication of glass capillary devices. [2021-0229]

关键词： Glass Chemicals Etching Microfabrication Hafnium Fabrication Corrosion Micro fabrication microfluidics tapered glass capillary chemical etching mechanical polishing

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Nanostructured Co3O4 Asymmetrically Deposited on a Single Carbon Cloth for an All-Solid-State integrated Hybrid Device with Reversible Zinc-Air High-Energy Conversion and Asymmetric Supercapacitive High-Power Delivery

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ENERGY & FUELS 2021年第15期35卷 12706-12717页

作者： Hou, Zhanrui Zhu, Bo Li, Guoxian Wang, Peng Meng, Chuizhou Guo, Shijie Liu, Changhong Fan, Shoushan Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equip Hebei Key Lab Smart Sensing & Human Robot Interac Sch Mech Engn Tianjin 300401 Peoples R China Tsinghua Univ Tsinghua Foxconn Nanotechnol Res Ctr Beijing 100084 Peoples R China Tsinghua Univ Dept Phys Beijing 100084 Peoples R China

Hybrid energy devices combining multiple energy components based on different mechanisms can provide a more comprehensive output performance than individual ones. However, past attempts of connecting separate parts through additional wire connections have limitations of low energy efficiency and bulky system formation. Herein, we develop a hybrid energy device that integrates a rechargeable zinc-air battery and an asymmetric supercapacitor on a single carbon-cloth-based platform. Nanostructured Co3O4 is asymmetrically deposited in different regions of the carbon cloth to obtain bi-functions as pseudocapacitive positive electrode and catalytic air electrode. A moisturizing gel polymer electrolyte is also used to make the device integrative, compact, and flexible. A working mechanism and an operation strategy of repeated in situ charging of the supercapacitor part by the zinc-air battery part and external recharging of the zinc-air battery part are proposed and evaluated with demonstration of powering a vibration motor. The developed hybrid energy device can be self-charged to 1.15 V in 200 s followed by delivering a peak power density of 7.91 mW cm(-2) for 50 repeated cycles and be fully recharged by an external power source again. Thus, both zinc-air high-energy conversion and asymmetric supercapacitive high-power delivery are simultaneously achieved on such a single device, which has a potential use in portable and wearable electronic applications.

关键词： Capacitors Electrical energy Energy Batteries Electrodes

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Biomechanical and Physiological Evaluation of Biologically-Inspired Hip Assistance With Belt-Type Soft Exosuits

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IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING 2022年 30卷 2802-2814页

作者： Chen, Qiang Guo, Shijie Wang, Jing Wang, Jiaxin Zhang, Dan Jin, Shanhai Hebei Univ Technol Sch Mech Engn State Key Lab Reliabil & Intelligence Elect Equip Hebei Key Lab Robot Sensing & Human Robot Interac Tianjin 300401 Peoples R China Tianjin Univ Sport Key Lab Exercise Physiol & Sports Med Tianjin 301617 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China York Univ Dept Mech Engn Toronto ON M3J 1P3 Canada Yanbian Univ Sch Engn Yanji 133002 Peoples R China

Hip-assisted soft exosuits have been reported for their effect on reducing the metabolic power of human walking. Currently, most studies focus on uni-directional assistance (HF: hip flexion, or HE: hip extension). This paper investigates the effect of bi-directional assistance (HFE: hip flexion and extension) on the biomechanics and physiology of the wearer for understanding the potential benefits in synergistic effect of multi-muscle assistance. A belt-type soft exosuit was developed to provide the bi-directional assistance for augmenting walking. The assistance strategy was presented by imitating the contraction mechanisms of hip flexor and extensor muscles in walking. Tests on 8 healthy subjects were conducted and the results were compared with traditional uni-directional assistance. Metabolic powers, muscle activities, kinematics, and kinetics were measured and analyzed. Results showed that HFE assistance reduced the metabolic power by 7% and 12.4% relative to no exosuit and assistance turned off, respectively, larger than the sum of HF and HE. Furthermore, HFE reduced more total joint positive biological work and the activity of more related muscles, and at the same time increased upward and downward accelerations of body mass center, promoting walking energy exchange. These findings demonstrate that bi-directional assistance by combining hip flexion and extension has a significant synergistic effect on augmenting human walking as well as a benefit of increasing biological efficiency.

关键词： Hip Legged locomotion Muscles Actuators Belts Force Hafnium Soft exosuit hip assistance muscle contraction metabolic power synergistic effect

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Force Tracking Control With Adaptive Stiffness and Iterative Position of Hip-Assistive Soft Exosuits

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IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING 2024年第4期21卷 7203-7218页

作者： Chen, Qiang Guo, Shijie Zhang, Dan Hebei Univ Technol Hebei Key Lab Robot Sensing & Human Robot Interact Sch Mech Engn Engn Res CtrMinist Educ Intelligent Rehabil Equip Tianjin 300401 Peoples R China York Univ Dept Mech Engn Toronto ON M3J 1P3 Canada Fudan Univ Inst Robot & AI Shanghai 200433 Peoples R China York Univ Dept Mech Engn Toronto ON M3J 1P3 Canada

Soft exosuits feature nonlinear, low stiffness, and hysteretic behavior, presenting different mechanical responses during loading and unloading of assistive force. Delivering the desired force to the wearer is a challenge in such a system. To address this issue, this article proposed a novel control strategy with adaptive stiffness and iterative position to optimize the assistive forces of the actuators in compliance with the humanexosuit interface stiffness and relative motion. Specifically, a stiffness model was proposed to describe the force loading and unloading behaviors, further an adaptive stiffness-based force controller was designed to improve the force tracking for whole profile by adaptively adjusting the stiffness parameters related to loading and unloading, and iteratively compensating the position error associated with the force amplitude in the model on a step-by-step basis. This control strategy was implemented on a soft exosuit for hip flexion and extension assistance, and its performance was evaluated through walking tests on six subjects. The results showed that after 4 or 5 iterations of optimization based on the initial parameter settings, the proposed controller could comply with the human-exosuit interface stiffness and achieved an improved force tracking, with a minimal root-mean-square error of 7.5 N in desired force profiles tracking, and a metabolic gain of 14.8%, demonstrating a promising potential of the proposed controller for improving the force tracking and the economy of human walking.

关键词： Soft exosuits hip assistance force tracking adaptive stiffness control iterative optimization

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Biomimetic Design of A Chest Carrying Nursing-care robot for Transfer Task

Biomimetic Design of A Chest Carrying Nursing-care Robot for...

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IEEE International Conference on robotics and Biomimetics (ROBIO)

作者： Liu, Yuxin Chen, Guiliang Liu, Jinyue Guo, Shijie Mukai, Toshiharu Hebei Key Lab Robot Sensing & Human Robot Interac State Key Lab Reliabil & Intelligence Elect Equip Tianjin Peoples R China Hebei Univ Technol Tianjin Peoples R China RIKEN 2-1 Hirosawa Wako Saitama 3510198 Japan Meijo Univ Tempaku Ku 1-501 Shiogamaguchi Nagoya Aichi 4688502 Japan

ISBN: (纸本)9781728103778

Patient transfer, such as lifting and moving a bedridden patient from a bed to a wheelchair or a pedestal pan and back, is one of the most physically challenging tasks in nursing care. We have developed a prototype nursing-care assistant robot that can conduct patient transfer by imitating the motion when a person holds another person on his/her back. Based on the measurement of human motions including back-chest touching, leaning forward, holding up, moving and putting down, we analyzed the key factors that may influence the safety and comfort of the patient and designed a new type of robot. The robot consists of a chest holder which moves like a human back. In this paper, we state the details of motion design and related kinematic/dynamic analysis of the robot and demonstrate its effect on patient transfer. It is demonstrated that the robot developed can transfer a subject from a bed to a chair and back.

关键词： Machine design

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Direct Laser Writing of the Porous Graphene Foam for Multiplexed Electrochemical Sweat Sensors

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ACS APPLIED MATERIALS & INTERFACES 2023年第29期15卷 34332-34342页

作者： Yang, Li Wang, He Abdullah, Abu Musa Meng, Chuizhou Chen, Xue Feng, Anqi Cheng, Huanyu Hebei Univ Technol Sch Hlth Sci & Biomed Engn State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Penn State Univ Dept Engn Sci & Mech University Pk PA 16802 USA Hebei Univ Technol Sch Mech Engn State Key Lab Reliabil & Intelligence Elect Equipm Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300401 Peoples R China Hebei Univ Technol Sch Elect Engn State Key Lab Reliabil & Intelligence Elect Equipm Key Lab Bioelectromagnet & Neuroengn Hebei Prov Tianjin 300130 Peoples R China

Wearableelectrochemical sensors provide means to detect molecular-levelinformation from the biochemical markers in biofluids for physiologicalhealth evaluation. However, a high-density array is often requiredfor multiplexed detection of multiple markers in complex biofluids,which is challenging with low-cost fabrication methods. This workreports the low-cost direct laser writing of porous graphene foamas a flexible electrochemical sensor to detect biomarkers and electrolytesin sweat. The resulting electrochemical sensor exhibits high sensitivityand low limit of detection for various biomarkers (e.g., the sensitivityof 6.49/6.87/0.94/0.16 & mu;A & mu;M-1 cm(-2) and detection limit of 0.28/0.26/1.43/11.3 & mu;Mto uric acid/dopamine/tyrosine/ascorbic acid) in sweat. The resultsfrom this work open up opportunities for noninvasive continuous monitoringof gout, hydration status, and drug intake/overdose.

关键词： direct laser writing porous graphene foam wearable electrochemical sweatsensors multiplexed biomarkerdetections health monitoring

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Detachable and reassemble sandwiching device with high dynamic range for multivolume droplet digital polymerase chain reactions

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SENSORS AND ACTUATORS B-CHEMICAL 2024年 412卷

作者： Wei, Chunyang Yu, Chengzhuang Meng, Jiyu Li, Junwei Li, Qinghua Li, Shanshan Shandong First Med Univ & Shandong Acad Med Sci Coll Artificial Intelligence & Big Data Med Sci Jinan 250117 Peoples R China Hebei Univ Technol Sch Mech Engn Hebei Key Lab Robot Sensing & Human Robot Interact Tianjin 300132 Peoples R China Tianjin Univ Sci & Technol Coll Mech Engn Tianjin 300222 Peoples R China Hebei Univ Technol Inst Biophys Sch Hlth Sci & Biomed Engn Tianjin 300401 Peoples R China

Droplet digital polymerase chain reaction (ddPCR) can achieve absolute nucleic acid quantification by analyzing thousands of independent droplets. Nevertheless, the challenges, including high chip cost, complex dropletproduction operation, and low system integration, still hinder its widespread application. Here, we propose a detachable ddPCR device assembled by a 3D-printed photosensitive resin, an elastic PDMS film, and a glass substrate. The device is prefilled with mineral oil and is easy to assemble, detach and reassemble for reuse. With the predesigned microstructures, smaller and bigger droplets are step-emulsified for multivolume droplets. The smaller ones (Phi = 97.13 +/- 2.71 mu m, n approximate to 6 000) are used to improve the upper limit of quantification (ULQ), and the larger ones (Phi = 258.27 +/- 4.53 mu m, n approximate to 1 000) are used to decline the lower detection limit (LDL). Benefits from the multivolume design, the proposed ddPCR device obtains an ultra-wide dynamic range of over 10(5). The device allows for droplet production, single-layer self-assembly, thermal cycling, and fluorescence acquisition in one device, resulting in a miniaturized and simplified ddPCR system. We applied this device in quantifying PCR reagents with concentrations from 1 copy/mu L to 1 000 copies/mu L. Statistical analysis of the expected and experimental DNA copy numbers indicates that the device holds excellent quantification performance. With the characteristics of low chip cost, simplified operation, wide dynamic range, and high system integration, the proposed device is expected to broaden the applications of ddPCR, including single-cell expression, copy number variation, and point-of-care fields.

关键词： Digital PCR Multivolume droplets High dynamic range Assembled device Reusability

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Classification of Respiratory Sounds into Crackles and Noncrackles Categories via Convolutional Neural Networks 21

Classification of Respiratory Sounds into Crackles and Noncr...

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21st IEEE International Conference on Mechatronics and Automation (IEEE ICMA)

作者： Qi Dexuan Ye, Yuan Zhao Haiwen Wu Wenjuan Guo Shijie Minist Educ Intelligent Rehabil Equipment & Detec Engn Res Ctr Tianjin Peoples R China Hebei Key Lab Robot Sensing & Human Robot Interac Tianjin Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin Peoples R China Wuhan Jinyintan Hosp Wuhan Peoples R China

ISBN: (数字)9798350388077

ISBN: (纸本)9798350388084;9798350388077

When evaluating the efficacy of expectoration, it is essential not only to consider the subjective perception of patients but also to rely on objective assessment indicators. Crackles, as a crucial indicator for evaluating expectoration effectiveness, have rarely been independently classified in existing research. Additionally, approximately half of pulmonary sounds are incorrectly identified by hospital interns and medical students. To address these challenges, an automatic identification model for crackles is developed. A Convolutional Neural Network (CNN) is employed to classify 1864 instances of crackles and 2291 instances of noncrackles (including rhonchi, wheezes, and normal lung sounds). The model combines pre-trained image feature extractors, respiratory sound data, and a CNN classifier. After training and evaluation, a predictive accuracy of 0.875 is achieved, with an area under the receiver operating characteristic (ROC) curve of 0.89. This research aims to provide objective assessment indicators for expectoration treatment for patients through our research findings.

关键词： Crackles Expectoration Convolutional Neural Network

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Continuously-Tunable and Ultrawide-Range Thermal Regulator Based on Superaligned Carbon Nanotube Aerogels for Dynamic Thermal Management of Batteries and Buildings

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ADVANCED FUNCTIONAL MATERIALS 2024年第22期34卷 2314021-2314021页

作者： Yu, Wei Dai, Wenhua Hong, Zixin Li, Guoxian Wang, Ziying Meng, Chuizhou Wang, Jiaping Liu, Changhong Guo, Shijie Fan, Shoushan Hebei Univ Technol Hebei Key Lab Smart Sensing & Human Robot Interact State Key Lab Reliabil & Intelligence Elect Equipm Sch Mech EngnEngn Res CtrMinist Educ Intelligent Tianjin 300401 Peoples R China Tsinghua Univ Tsinghua Foxconn Nanotechnol Res Ctr Beijing 100084 Peoples R China Tsinghua Univ Dept Phys Beijing 100084 Peoples R China

Efficient heat transfer control is highly demanded for dynamic thermal management of equipment and buildings especially when the environmental temperature dramatically changes. Thermal switches, the current approach of heat transfer control, suffer from the issues of low switching ratios below eight and sharp state transition between "on" and "off". Herein, a continuously-tuned thermal regulator with an ultrahigh thermal-conductivity change ratio of 43 based on superaligned carbon nanotube aerogel is reported, which works on the regulation of both thermal interfacial resistance and conduction pathways by compressive deformation-induced microstructure evolution. This thermal regulator can stabilize the device temperature at 25 degrees C when the environmental temperature varies by 7 and 11 degrees C under the natural convection and forced convection conditions, respectively. Toward practical application, the thermal regulator with flexibility is wrapped around a cylindrical lithium-ion battery to control the operation temperature within the optimal range of 20-40 degrees C for enhanced discharging performance even at an environmental temperature of -20 degrees C. Besides, by combining the thermal regulator with radiative cooling film, the house model temperature can be lowered by 2.7 degrees C during daytime and raised by 1.1 degrees C during nighttime compared with the bare one. This efficient thermal regulation approach offers an effective solution for practical thermal management.

关键词： CNT aerogel dynamic thermal management heat transfer control lithium-ion battery radiative cooling

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Adaptive Reflection Detection and Control Strategy of Pointer Meters Based on YOLOv5s

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SENSORS 2023年第5期23卷 2562页

作者： Liu, Deyuan Deng, Changgen Zhang, Haodong Li, Jinrong Shi, Baojun Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300401 Peoples R China Hebei Key Lab Robot Sensing & Human Robot Integrat Tianjin 300401 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China

Reflective phenomena often occur in the detecting process of pointer meters by inspection robots in complex environments, which can cause the failure of pointer meter readings. In this paper, an improved k-means clustering method for adaptive detection of pointer meter reflective areas and a robot pose control strategy to remove reflective areas are proposed based on deep learning. It mainly includes three steps: (1) YOLOv5s (You Only Look Once v5-small) deep learning network is used for real-time detection of pointer meters. The detected reflective pointer meters are preprocessed by using a perspective transformation. Then, the detection results and deep learning algorithm are combined with the perspective transformation. (2) Based on YUV (luminance-bandwidth-chrominance) color spatial information of collected pointer meter images, the fitting curve of the brightness component histogram and its peak and valley information is obtained. Then, the k-means algorithm is improved based on this information to adaptively determine its optimal clustering number and its initial clustering center. In addition, the reflection detection of pointer meter images is carried out based on the improved k-means clustering algorithm. (3) The robot pose control strategy, including its moving direction and distance, can be determined to eliminate the reflective areas. Finally, an inspection robot detection platform is built for experimental study on the performance of the proposed detection method. Experimental results show that the proposed method not only has good detection accuracy that achieves 0.809 but also has the shortest detection time, which is only 0.6392 s compared with other methods available in the literature. The main contribution of this paper is to provide a theoretical and technical reference to avoid circumferential reflection for inspection robots. It can adaptively and accurately detect reflective areas of pointer meters and can quickly remove them by controlling the

关键词： inspection robot YOLOv5s k-means clustering algorithm reflection detection pose transformation

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