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| 1 | Self-Healing Liquid Metal Magnetic Hydrogels for Smart Feedback Sensors and High-Performance Electromagnetic Shielding显示文摘Hydrogels exhibit potential applications in smart wearable devices because of their exceptional sensitivity to various external stimuli.However,their applications are limited by challenges in terms of issues in biocompatibility,custom shape,and self-healing.Herein,a conductive,stretchable,adaptable,self-healing,and biocompatible liquid metal GaInSn/Ni-based composite hydrogel is developed by incorporating a magnetic liquid metal into the hydrogel framework through crosslinking polyvinyl alcohol(PVA)with sodium tetraborate.The excellent stretchability and fast self-healing capability of the PVA/liquid metal hydrogel are derived from its abundant hydrogen binding sites and liquid metal fusion.Significantly,owing to the magnetic constituent,the PVA/liquid metal hydrogel can be guided remotely using an external magnetic field to a specific position to repair the broken wires with no need for manual operation.The composite hydrogel also exhibits sensitive deformation responses and can be used as a strain sensor to monitor various body motions.Additionally,the multifunctional hydrogel displays absorption-dominated electromagnetic interference(EMI)shielding properties.The total shielding performance of the composite hydrogel increases to~62.5 dB from~31.8 dB of the pure PVA hydrogel at the thickness of 3.0 mm.The proposed bioinspired multifunctional magnetic hydrogel demonstrates substantial application potential in the field of intelligent wearable devices. | Biao Zhao Zhongyi Bai Hualiang Lv Zhikai Yan Yiqian Du Xiaoqin Guo Jincang Zhang Limin Wu Jiushuai Deng David Wei Zhang Renchao Che | 2023 | Nano-Micro Letters2023，15，6： | 3 |
| 2 | Enhance the delivery of light energy ultra-deep into turbid medium by controlling multiple scattering photons to travel in open channels显示文摘Multiple light scattering is considered as the major limitation for deep imaging and focusing in turbid media.In this paper,we present an innovative method to overcome this limitation and enhance the delivery of light energy ultradeep into turbid media with significant improvement in focusing.Our method is based on a wide-field reflection matrix optical coherence tomography(RM-OCT).The time-reversal decomposition of the RM is calibrated with the Tikhonov regularization parameter in order to get more accurate reversal results deep inside the scattering sample.We propose a concept named model energy matrix,which provides a direct mapping of light energy distribution inside the scattering sample.To the best of our knowledge,it is the first time that a method to measure and quantify the distribution of beam intensity inside a scattering sample is demonstrated.By employing the inversion of RM to find the matched wavefront and shaping with a phase-only spatial light modulator,we succeeded in both focusing a beam deep(~9.6 times of scattering mean free path,SMFP)inside the sample and increasing the delivery of light energy by an order of magnitude at an ultra-deep(~14.4 SMFP)position.This technique provides a powerful tool to understand the propagation of photon in a scattering medium and opens a new way to focus light inside biological tissues. | Jing Cao Qiang Yang Yusi Miao Yan Li Saijun Qiu Zhikai Zhu Pinghe Wang Zhongping Chen | 2022 | Light(Science & Applications)2022，11，5： | 2 |
| 3 | Effect of Ni- based catalyst on bio-oil upgrading under CO atmosphere 显示文摘 | Xu Qingli Zhang Zhikai Yan Yongjie | 2013 | Chemical Engineering and Technology2013，36，12： | 1 |
| 4 | In-situ grown Ni Co bimetal anchored on porous straw-derived biochar composites with boosted microwave absorption properties显示文摘With the gradually increasing protection awareness about electromagnetic pollution,the demand for absorbing materials with renewability and environmental friendliness has attracted widespread attention.In this work,composites consisting of straw-derived biochar combined with NiCo alloy were successfully fabricated through high-temperature carbonization and subsequent hydrothermal reaction.The electromagnetic parameters of the porous biocarbon/NiCo composites can be effectively modified by altering their NiCo content,and their improved absorbing performance can be attributed to the synergy effect of magnetic-dielectric characteristics.An exceptional reflection loss of-27.0 dB at 2.2 mm thickness and an effective absorption bandwidth of 4.4 GHz(11.7-16.1 GHz)were achieved.These results revealed that the porous biocarbon/NiCo composites could be used as a new generation absorbing material because of their low density,light weight,excellent conductivity,and strong absorption. | Yuanyuan Zhou Zhongyi Bai Xiangyang Yang Wei Liu Bingbing Fan Zhikai Yan Xiaoqin Guo | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，3： | 0 |
| 5 | Building a Post-Layout Simulation Performance Model with Global Mapping Model Fusion Technique显示文摘Building a post-layout simulation performance model is essential in closing the loop of analog circuits, but it is a challenging task because of the high-dimensional space and expensive simulation cost. To facilitate efficient modeling, this paper proposes a Global Mapping Model Fusion(GMMF) technique. The key idea of GMMF is to reuse the schematic-level model trained by the Artificial Neural Network(ANN) algorithm, and combine it with few mapping coefficients to build the post-simulation model. Furthermore, as an efficient global optimization algorithm,differential evolution is applied to determine the optimal mapping coefficients with few samples. In GMMF, only a small number of mapping coefficients are unknown, so the number of post-layout samples needed is significantly reduced. To enhance practical utility of the proposed GMMF technique, two specific mapping relations, i.e., linear or weakly no-linear and nonlinear, are carefully considered in this paper. We conduct experiments on two topologies of two-stage operational amplifier and comparator in different commercial processes. All the simulation data for modeling are obtained from a parametric design framework. A more than 5 runtime speedup is achieved over ANN without surrendering any accuracy. | Zhikai Wang Wenfei Hu Sen Yin Ruitao Wang Jian Zhang Yan Wang Zuochang Ye | 2022 | Tsinghua Science and Technology2022，27，3： | 0 |
| 6 | An Early-Stop Adjoint Transient Sensitivity Analysis Method for Objective Functions Associated with Many Time Points显示文摘Transient sensitivity analysis aims to obtain the gradients of objective functions(circuit performance)with respect to design or variation parameters in a simulator,which can be widely used in yield analysis and circuit optimization,among others.However,the traditional method has a computational complexity of O(N^(2))for objective functions containing circuit states at N time points.The computational complexity is too expensive for large N,especially in time-frequency transform.This paper proposes a many-time-point sensitivity method to reduce the computational complexity to O(N)in multiparameter many-time-point cases.The paper demonstrates a derivation process that improves efficiency by weighting the transfer chain and multiplexing the backpropagation process.We also proposed an early-stop method to improve efficiency further under the premise of ensuring accuracy.The algorithm enables sensitivity calculation of performances involving thousands of time points,such as signal-to-noise and distortion ratio and total harmonic distortion,with significant speed improvements. | Wenfei Hu Sen Yin Liang Wang Chunxue Liu Zhikai Wang Zuochang Ye Yan Wang | 2023 | Tsinghua Science and Technology2023，28，3： | 0 |
| 7 | Ultrahigh-sensitive optical coherence elastography显示文摘The phase stability of an optical coherence elastography(OCE)system is the key determining factor for achieving a precise elasticity measurement,and it can be affected by the signal-to-noise ratio(SNR),timing jitters in the signal acquisition process,and fluctuations in the optical path difference(OPD)between the sample and reference arms.In this study,we developed an OCE system based on swept-source optical coherence tomography(SS-OCT)with a common-path configuration(SS-OCECP).Our system has a phase stability of 4.2 mrad without external stabilization or extensive post-processing,such as averaging.This phase stability allows us to detect a displacement as small as~300 pm.A common-path interferometer was incorporated by integrating a 3-mm wedged window into the SS-OCT system to provide intrinsic compensation for polarization and dispersion mismatch,as well as to minimize phase fluctuations caused by the OPD variation.The wedged window generates two reference signals that produce two OCT images,allowing for averaging to improve the SNR.Furthermore,the electrical components are optimized to minimize the timing jitters and prevent edge collisions by adjusting the delays between the trigger,k-clock,and signal,utilizing a high-speed waveform digitizer,and incorporating a high-bandwidth balanced photodetector.We validated the SSOCECP performance in a tissue-mimicking phantom and an in vivo rabbit model,and the results demonstrated a significantly improved phase stability compared to that of the conventional SS-OCE.To the best of our knowledge,we demonstrated the first SS-OCECP system,which possesses high-phase stability and can be utilized to significantly improve the sensitivity of elastography. | Yan Li Sucbei Moon Jason JChen Zhikai Zhu Zhongping Chen | 2020 | Light(Science & Applications)2020，9，1： | 0 |
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