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Robust,self-adhesive,and low-contact impedance polyvinyl alcohol/polyacrylamide dual-network hydrogel semidry electrode for biopotential signal acquisition

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SmartMat 2024年第2期5卷 67-82页

作者： Guangli Li Ying Liu Yuwei Chen Yonghui Xia Xiaoman Qi Xuan Wan Yuan Jin Jun Liu Quanguo He Kanghua Li jianxin tang Hunan Key Laboratory of Biomedical Nanomaterials and Devices College of Life Sciences and ChemistryHunan University of TechnologyZhuzhouChina Department of Neurology Zhuzhou People's HospitalZhuzhouChina Zhuzhou Institute for Food and Drug Control ZhuzhouChina

Herein,we fabricated a flexible semidry electrode with excellent mechanical performance,satisfactory self-adhesiveness,and low-contact impedance using physical/chemical crosslinked polyvinyl alcohol/polyacrylamide dual-network hydrogels(PVA/PAM DNHs)as an efficient saline *** resultant PVA/PAM DNHs showed admirable adhesive and compliance to the hairy scalp,facilitating the establishment of a robust electrode/skin interface for biopotential signal ***,the PVA/PAM DNHs steadily released trace saline onto the scalp to achieve the minimized potential drift(1.47±0.39 mV/min)and low electrode–scalp impedance(18.2±8.9 kΩ@10 Hz).More importantly,the application feasibility of real-world brain−computer interfaces(BCIs)was preliminarily validated by 10 participants using two classic BCI *** mean temporal cross-correlation coefficients between the semidry and wet electrodes in the eyes open/closed and the N200 speller paradigms are 0.919±0.054 and 0.912±0.050,*** electrodes demonstrate anticipated neuroelectrophysiological responses with similar *** semidry electrode could also effectively capture robust P-QRS-T peaks during electrocardiogram *** their outstanding advantages of fast setup,user-friendliness,and robust signals,the proposed PVA/PAM DNH-based electrode is a promising alternative to wet electrodes in biopotential signal acquisition.

关键词： brain-computer interface dual-network hydrogel electrocardiogram signals electroencephalography signals semidry electrode

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Acid-etching induced metal cation competitive lattice occupancy of perovskite quantum dots for efficient pure-blue QLEDs

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Interdisciplinary Materials 2024年第3期3卷 437-447页

作者： Hanwen Zhu Guoqing Tong Junchun Li Xuyong Tao Yang Shen Yuanyuan Sheng Lin Shi Fengming Xie jianxin tang Yang Jiang School of Materials Science and Engineering Hefei University of TechnologyHefeiPeople's Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhouPeople's Republic of China

Low efficiency and spectral instability caused by the surface defects have been considerable issues for the mixed-halogen blue emitting perovskite quantum dots light-emitting diodes(PeQLEDs).Here,an in situ surface passivation to perovskite quantum dots(PeQDs)is realized by introducing the metal cations competitive lattice occupancy assisted with acid-etching,in which the longchain,insulating and weakly bond surface ligands are removed by addition of octanoic acid(OTAC).Meanwhile,the dissolved A-site cations(Na^(+))compete with the protonated oleyl amine and are subsequently anchored to the surface *** preadded lead bromide,acting as inorganic ligands,demonstrates strong bonding to the uncoordinated surface *** as-synthesized PeQDs show the boosted photoluminescence quantum yield(PLQY)and superior stability with longer *** a result,the PeQLEDs(470 nm)based on the OTAC-Na PeQDs exhibit an external quantum efficiency of 8.42%in the mixed halogen PeQDs(CsPb(Br_(x)Cl_(1−x))_(3)).Moreover,the device exhibits superior spectra stability with negligible *** competition mechanism in combination with in situ passivation strategy paves a new way for improving the performance of blue PeQLEDs.

关键词： acid etching blue PeQLEDs high-efficiency in situ passivation spectral stability

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Identifying influential spreaders in social networks: A two-stage quantum-behaved particle swarm optimization with Lévy flight

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Chinese Physics B 2024年第1期33卷 743-754页

作者：卢鹏丽揽继茂唐建新张莉宋仕辉朱虹羽 Wenzhou Engineering Institute of Pump&Valve Lanzhou University of TechnologyWenzhou 325100China School of Computer and Communication Lanzhou University of TechnologyLanzhou 730050China

The influence maximization problem aims to select a small set of influential nodes, termed a seed set, to maximize their influence coverage in social networks. Although the methods that are based on a greedy strategy can obtain good accuracy, they come at the cost of enormous computational time, and are therefore not applicable to practical scenarios in large-scale networks. In addition, the centrality heuristic algorithms that are based on network topology can be completed in relatively less time. However, they tend to fail to achieve satisfactory results because of drawbacks such as overlapped influence spread. In this work, we propose a discrete two-stage metaheuristic optimization combining quantum-behaved particle swarm optimization with Lévy flight to identify a set of the most influential spreaders. According to the framework,first, the particles in the population are tasked to conduct an exploration in the global solution space to eventually converge to an acceptable solution through the crossover and replacement operations. Second, the Lévy flight mechanism is used to perform a wandering walk on the optimal candidate solution in the population to exploit the potentially unidentified influential nodes in the network. Experiments on six real-world social networks show that the proposed algorithm achieves more satisfactory results when compared to other well-known algorithms.

关键词： social networks influence maximization metaheuristic optimization quantum-behaved particle swarm optimization Lévy flight

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Influence of depth-thickness ratio of mining on the stability of a bedding slope with its sliding surface in concave deformation

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International Journal of Mining Science and Technology 2016年第6期26卷 1117-1123页

作者： Zhang Yuning tang jianxin Li Guodong Teng Junyang State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University

In order to study the influence of depth-thickness ratio on bedding slope stability, whose sliding surface is flexural concave in shape under mining conditions, this paper aims to study the characteristics ofdeformarion and damage of bedding sliding with depth-thickness ratios of 200：1,150：1,120：1,100：1 and 50：1 by adopting numerical simulation analysis software combined with laboratory-made ＂under the influence of mining variable sliding surface slope similar simulation test bed＂, and to propose identification methods for slope stability under the infuence of mining. The results show that mining activities under the slope reduce slope stability. With a decrease in the mining depth ratio, the influence of mining on the slope increases gradually, and the damage to the slope gradually expands, the stability of the slope grad- ually reduces, fracture occurs on the slope toe and the central fissure gradually develops to the surface, and reaches slide threshold when the depth-thickness ratio is 50：1.

关键词： Depth-thickness ratio Bedding slope Sliding surface Concave deflection surface Mining influence Similar simulation

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Highly bright and low turn-on voltage CsPbBr3 quantum dot LEDs via conjugation molecular ligand exchange

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Nano Research 2019年第1期12卷 109-114页

作者： Guopeng Li Jingsheng Huang Yanqing Li jianxin tang Yang Jiang School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Institute of Functional Nano&Soft Materials(FUNSOM) Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215123China

All-inorganic CsPbBr3 perovskite quantum dots (QDs) hold great promise as candidate materials for next-generation electroluminescent displays owing to their excellent optoelectronic ***,the long insulating ligands on the surface of CsPbBr3 QDs originating from the synthesis process hinder the fabrication of high-performance optoelectronic ***,an efficient ligand-exchange route is proposed with the use of perovskite-precursor-based halide ligands,including a series of phenalkylammonium bromides with a π-conjugation benzene ring and different branch *** on the ligand-exchange method,the conductivity of the CsPbBr3 QD layer is significantly improved owing to ligand shortening and the insertion of the π-conjugation benzene *** a result,high brightness (up to 12,650 cd/m2)and low tum-on voltage (as low as 2.66 V) can be realized in CsPbBr3 QD light-emitting diodes (QLEDs),leading to dramatic improvements in device performance with a current efficiency of 13.43 cd/A,power efficiency of 12.05 lm/W,and external quantum efficiency of 4.33%.

关键词： CsPbBr3 quantum dots perovskite light-emitting diodes ligand exchange π-conjugation

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Analysis and application in controlling surrounding rock of support reinforced roadway in gob-side entry with fully mechanized mining

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Mining Science and Technology 2010年第6期20卷 839-845页

作者： DENG Yuehua tang jianxin ZHU Xiangke FU Yong DAI Zhangyin College of Resources and Environmental Science Chongqing University Chongqing 400030 China jingang Coal Mine Dazhu Coal & Electric Group Dazhou 635000 China College of Mining Guizhou University Guiyang 550003 China

In order to optimize gob-side entry in fully-mechanized working face in moderate-thick-coal seams, we adopt a new attempt to pack roadside by pumping ordinary concrete, which is very important for the development of gob-side entry technology. The concrete has a long initial setting time and a low initial strength. So it is difficult to control the surrounding rock. In this paper, we analyze the effect of using roadside cable to reinforce supporting in gob-side entry surrounding rock controlling based on elas-tic-plastic and material mechanics knowledge. And then we propose a scheme that cable is used to reinforce roadside supporting and a single hydraulic prop is used as the temporary supporting in gob side. Using the numerical simulation software FLAC2D, we numerically simulated supporting scheme. Results of both the 2D modeling and the industrial test on No.3117 face in Jingang Mine prove that the scheme is feasible. The results show that the technology of protecting the roadway in gob-entry retained efficiently make up the deficiency of roadside packing with ordinary concrete, effectively control the roof strata and acquire a good result of retaining roadway.

关键词： gob-side entry retained surrounding rock controlling cable reinforced roadside supporting FLAC2D single hydraulic prop roadside support pumping of concrete

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Do goodwill impairments affect audit opinions?Evidence from China

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China Journal of Accounting Research 2021年第2期14卷 151-182页

作者： Ziye He Dong Chen jianxin tang Economics and Management School Wuhan University

There has been a steady growth of goodwill impairments in the Chinese stock market since the adoption of the impairment approach in *** influence of goodwill impairments on a firm’s financial position and profitability give reason to doubt its current and future *** examine whether auditors,as a crucial external monitor,identify the information risks of goodwill impairments and express their concerns about financial reporting quality in their audit *** a sample of firms listed on China’s Ashare market from 2007 to 2017,we test the association between goodwill impairments and the type of audit opinion received in the same financial *** findings are as ***,the probability of receiving a modified opinion increases with the amount of goodwill ***,the positive association between goodwill impairments and modified audit opinions is driven primarily by earnings management ***,this positive association is more salient when auditors are industry experts and there is no auditor–client ***,auditors are more sensitive to the amount of goodwill impairments than to their mere ***,we document that auditors perceive goodwill impairments as a signal of information risks and communicate their concerns to investors to avoid litigation.

关键词： Goodwill impairments Audit opinions Material misstatements Earnings management Economic fundamentals

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Recent advances in flexible and wearable organic optoelectronic devices

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Journal of Semiconductors 2018年第1期39卷 153-174页

作者： Hong Zhu Yang Shen Yanqing Li jianxin tang College of Nano Science and Technology Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratoryfor Carbon-Based Functional Materials & Devices Soochow University Institute of Organic Optoelectronics(IOO) JITRI

Flexible and wearable optoelectronic devices have been developing to a new stage due to their unique capacity for the possibility of a variety of wearable intelligent electronics, including bendable smartphones, foldable touch screens and antennas, paper-like displays, and curved and flexible solid-state lighting devices. Before extensive commercial applications, some issues still have to be solved for flexible and wearable optoelectronic devices. In this regard, this review concludes the newly emerging flexible substrate materials, transparent conductive electrodes, device architectures and light manipulation methods. Examples of these components applied for various kinds of devices are also summarized. Finally, perspectives about the bright future of flexible and wearable electronic devices are proposed.

关键词： flexible electronics optoelectronic devices wearable devices

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岩块宏细观参数对垮落带岩体力学特性的影响

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矿业研究与开发 2024年第1期44卷 73-81页

作者：林圆唐建新袁芳孔令锐李成王潇鲁思佳重庆大学煤矿灾害动力学与控制国家重点实验室重庆400044 重庆大学资源与安全学院重庆400044

为研究岩块的宏细观参数对垮落带岩体力学特性的影响,采用现场试验方法对采空区岩芯试样进行侧限压缩试验;基于试验结果采用PFC3D数值模拟方法开展了工程尺度下垮落带压缩变形特性的数值模拟,分析了模型尺寸、岩块块度、碎胀系数和细观... 详细信息

为研究岩块的宏细观参数对垮落带岩体力学特性的影响,采用现场试验方法对采空区岩芯试样进行侧限压缩试验;基于试验结果采用PFC3D数值模拟方法开展了工程尺度下垮落带压缩变形特性的数值模拟,分析了模型尺寸、岩块块度、碎胀系数和细观力学参数对垮落带岩体力学特性的影响;并采用量纲法分析得到了垮落带的线性应力应变本构关系。结果表明,岩芯试样加载曲线近似线性变化,试样应力应变曲线的斜率随岩芯总长度的增加而增大;垮落带的压缩量随模型径高比和碎胀系数的增大而增大,随岩块块度、有效模量的增大而减小,当模型直径与高度的比值大于3∶1后,模型尺寸对垮落带压缩变形特性影响显著减小;当岩块块度大于1.3m后,垮落带的压缩变形曲线由指数增加变为线性增加;碎胀系数低于2.0时,垮落带压缩变形曲线呈线性变化,高于2.0后,应力应变曲线呈指数变化,垮落带的孔隙压密特性逐渐增强。

关键词：垮落带宏细观参数岩块块度力学特性量纲分析

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Spontaneous caving and gob-side entry retaining of thin seam with large inclined angle

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International Journal of Mining Science and Technology 2014年第4期24卷 441-445页

作者： Zhang Yongqin tang jianxin Xiao Daqiang Sun Lele Zhang Weizhong State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Sichuan Dazhu Coal-Electricity Group Corporation Zhangji Coal Mine Co. Ltd. Huainan Mining Group Co. Ltd. School of Environment and Civil Engineering Wuhan Institute of Technology

Based on the research method of combining simulation analysis with field testing by distinct element process UDEC, we have analyzed the roof deformation and failure laws and roadway support technology of gob-side entry retaining in a thin seam with a large inclined angle. The results show that during exploitation in seams with large inclined angle, rotational subsidence of the main roof under the gob area is small and can maintain balance, so there is no need to provide artificial permanent support resistance for the main roof near the upper side to control rotational subsidence. Obstructed by the dense scrap rail,waste rock from the immediate roof caving slides from the upper gob area to the lower area and fills it,which strikes a balance between the immediate roof under the goaf after it fractures into large pieces and filling waste rocks.

关键词： Large inclined angle Gob-side entry retaining Spontaneous caving Thin seam Field test

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