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Boosting thermal stability and crystallization of closed-loop-recyclable biodegradable poly(p-dioxanone) by end-group regulation

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Science China Chemistry 2024年第2期67卷 642-651页

作者： Jin Lei Zhu-xin gui Wan-Ting Xiong Gang Wu Si-Chong Chen Yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu610064China

A chemically closed-loop-recyclable biodegradable polymer,poly(p-dioxanone)(PPDO),is one of the ideal candidates for single-use plastic products due to its suitability for different application scenarios.Fascinatingly,when PPDO wastes can be collected,its monomer p-dioxanone(PDO) will be obtained through chemical recycling of these wastes;when cannot be collected,the wastes are able to be biodegraded into harmless substances.However,unsatisfied thermal stability and low crystallization rate of PPDO restrict its wider applications.Herein,based on end-group regulation,we simultaneously realized the significant enhancement of thermal stability and crystallization of PPDO through the simple melt processing with tributyl phosphite(TBP) or triphenyl phosphite(TPP).The model reactions were conducted to investigate the reaction mechanism and theoretical products during the preparation of PPDO/phosphite compounds.Two kinds of phosphites were proved to act as the end-capped reagent and chain extender in the melt processing,while TBP presented better reactivity.As a result,the activation energy of thermal decomposition was largely elevated,and the unprecedented T_(5%)(the temperature at a weight loss of 5%) and Tmax(the temperature at a maximum rate of weight loss) of PPDO were obtained,i.e.,T_(5%)of ~330 ℃ and Tmaxof ~385 ℃ in N_(2) atmosphere,T_(5%)of ~240 ℃ and Tmaxof ~317 ℃ in air atmosphere,respectively.Furthermore,the increased crystallization rate,crystallinity,crystalline orderliness,and realizable monomer recovery(yield >90%,purity >99.9%) of PPDO/phosphite compounds were confirmed.

关键词： poly(p-dioxanone) phosphite thermal stability crystallization end-group regulation

Emerging memristors and applications in reservoir computing

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Frontiers of physics 2024年第1期19卷 219-239页

作者： Hao Chen xin-gui Tang Zhihao Shen Wen-Tao Guo Qi-Jun Sun Zhenhua Tang Yan-Ping Jiang School of Physics and Optoelectronic Engineering Guangdong University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou 510006China

Recently, with the emergence of ChatGPT, the field of artificial intelligence has garnered widespread attention from various sectors of society. Reservoir Computing (RC) is a neuromorphic computing algorithm used to analyze time-series data. Unlike traditional artificial neural networks that require the weight values of all nodes in the trained network, RC only needs to train the readout layer. This makes the training process faster and more efficient, and it has been used in various applications, including speech recognition, image classification, and control systems. Its flexibility and efficiency make it a popular choice for processing large amounts of complex data. A recent research trend is to develop physical RC, which utilizes the nonlinear dynamic and short-term memory properties of physical systems (photonic modules, spintronic devices, memristors, etc.) to construct a fixed random neural network structure for processing input data to reduce computing time and energy. In this paper, we introduced the recent development of memristors and demonstrated the remarkable data processing capability of RC systems based on memristors. Not only do they possess excellent data processing ability comparable to digital RC systems, but they also have lower energy consumption and greater robustness. Finally, we discussed the development prospects and challenges faced by memristors-based RC systems.

关键词： reservoir computing memristor resistive switching artificial synapse neuromorphic computing

Coherent-detection-based distributed acoustic impedance sensing enabled by a chirped fiber Bragg grating array

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Photonics Research 2022年第6期10卷 1325-1331页

作者： ZHOU ZHENG ZHENGYING LI XUELEI FU xin gui Hubei Key Laboratory of Broadband Wireless Communication and Sensor Networks School of Information EngineeringWuhan University of TechnologyWuhan 430070China National Engineering Laboratory for Fiber Optic Sensing Technology Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China

Distributed optical fiber sensing exploring forward stimulated Brillouin scattering(FSBS)has received wide attention,as it indicates a new sensing method to measure the liquid property surrounding an optical fiber.In the existing techniques,backward stimulated Brillouin scattering is adopted for detection of the sensing signal,which requires time-consuming signal acquisition and post-processing.In this work,an approach that distributedly measures FSBS spectra is proposed and demonstrated based on coherent detection.While an excitation pulse with single-frequency amplitude modulation is used to induce a guided acoustic mode in the fiber,a following pulse is adopted to probe the induced phase modulation.Using a chirped fiber Bragg grating array,an enhancedbackward-propagating sensing signal is generated from the probe pulse.Heterodyne coherent-detection-based phase demodulation is then realized by mixing the sensing signal with a local oscillator.The FSBS spectra can then be reconstructed from the beat signals with only one round of frequency sweeping.With significantly accelerated signal acquisition and simplified post-processing,the proposed distributed acoustic sensing system has achieved spatial resolution of 5 m over a 500-m sensing range.

关键词： fiber scattering backward

Application of artificial synapse based on all-inorganic perovskite memristor in neuromorphic computing

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Nano Materials Science 2024年第1期6卷 68-76页

作者： Fang Luo Wen-Min Zhong xin-gui Tang Jia-Ying Chen Yan-Ping Jiang Qiu-Xiang Liu School of Physics&Optoelectric Engineering Guangdong University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou510006China

Artificial synapse inspired by the biological brain has great potential in the field of neuromorphic computing and artificial intelligence.The memristor is an ideal artificial synaptic device with fast operation and good tolerance.Here,we have prepared a memristor device with Au/CsPbBr_(3)/ITO structure.The memristor device exhibits resistance switching behavior,the high and low resistance states no obvious decline after 400 switching times.The memristor device is stimulated by voltage pulses to simulate biological synaptic plasticity,such as long-term potentiation,long-term depression,pair-pulse facilitation,short-term depression,and short-term potentiation.The transformation from short-term memory to long-term memory is achieved by changing the stimulation frequency.In addition,a convolutional neural network was constructed to train/recognize MNIST handwritten data sets;a distinguished recognition accuracy of~96.7%on the digital image was obtained in 100 epochs,which is more accurate than other memristor-based neural networks.These results show that the memristor device based on CsPbBr3 has immense potential in the neuromorphic computing system.

关键词： Memristor CsPbBr_(3) Resistive switching Artificial synapse Neuromorphic computing

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Effect of inflammatory response on joint function after hip fracture in elderly patients:A clinical study

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World Journal of Orthopedics 2024年第4期15卷 337-345页

作者： Jia-Ming Wang Yu-Tao Pan Chen-Song Yang Ming-Chong Liu Sheng-Chao Ji Ning Han Fang Liu gui-xin Sun Department of Traumatic Surgery Shanghai East HospitalSchool of MedicineTongji UniversityShanghai 200092China

BACKGROUND Excellent hip joint function facilitates limb recovery and improves the quality of survival.This study aimed to investigate the potential risk factors affecting postoperative joint functional activity and outcomes in elderly hip fractures patients and to provide evidence for patient rehabilitation and clinical management.AIM To explore the relationship between inflammatory factors and hip function and the interaction between inflammation and health after hip fracture in elderly patients.METHODS The elderly patients who had hip fracture surgery at our hospital between January 1,2021,and December 31,2022 were chosen for this retrospective clinical investigation.Patients with excellent and fair postoperative hip function had their clinical information and characteristics gathered and compared.Age,gender,fracture site,surgical technique,laboratory indices,and other variables that could have an impact on postoperative joint function were all included in a univariate study.To further identify independent risk factors affecting postoperative joint function in hip fractures,risk factors that showed statistical significance in the univariate analysis were then included in a multiple logistic regression analysis.In addition to this,we also compared other outcome variables such as visual analogue scale and length of hospital stay between the two groups.RESULTS A total of 119 elderly patients with hip fractures were included in this study,of whom 37 were male and 82 were female.The results of univariate logistic regression analysis after excluding the interaction of various factors showed that there was a statistically significant difference in interleukin(IL)-6,IL-8,IL-10,C-reactive protein(CRP),and complement C1q(C1q)between the fair and excellent joint function groups(P20 pg/mL[Odds ratio(OR)3.070,95%CI:1.243-7.579],IL-8>21.4 pg/mL(OR 3.827,95%CI:1.498-9.773),CRP>10 mg/L(OR 2.142,95%CI:1.020-4.498)and C1q>233 mg/L(OR 2.339,95%CI:1.094-

关键词： Hip function Fracture Inflammatory factors Risk factors Prevention

Oxygen and hydrogen peroxide self-supplying magnetic nanoenzymes for cancer therapy through magneto-mechanical force,force-induced reactive oxygen species,chemodynamic effects,and cytotoxicity of Ca^(2+) ions

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Nano Research 2023年第5期16卷 7134-7147页

作者： Jie Liu Wenxuan Yang Yuqiao Huang Ji Li Chunjiao Zhu Guangjin Pu Bo Wang xin gui Maoquan Chu Research Center for Translational Medicine at Shanghai East Hospital School of Life Sciences and TechnologyTongji UniversityShanghai 200092China Institute of Biophysics Chinese Academy of SciencesBeijing 100101China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

The use of magneto-mechanical force to kill cancer cells has attracted significant attention in recent years.However,many reports have focused on in vitro experiments with a single treatment.Herein,CaO_(2)-coated Fe_(3)O_(4)core–shell magnetic nanoenzymes(Fe_(3)O_(4)/CaO_(2))are developed for low frequency vibrating magnetic field(VMF)-induced multimodal cancer therapy.Fe_(3)O_(4)/CaO_(2)are shown to efficiently generate O_(2),H_(2)O_(2),·OH through hydrolysis of CaO_(2)and a CaO_(2)-strengthened Fenton reaction,killing laryngeal carcinoma cells and inhibiting mouse tumor growth(chemodynamic therapy(CDT)).Both Fe_(3)O_(4)and Fe_(3)O_(4)/CaO_(2)triggered by a VMF are shown to damage the cytoskeleton of cancer cells through magneto-mechanical force(maxima:223 piconewtons or larger by Fe_(3)O_(4)/CaO_(2)aggregations)and induce the generation of intracellular reactive oxygen species(ROS),the VMF-triggered Fe_(3)O_(4)/CaO_(2)is shown to generate additional intracellular ROS.Upon exposure to a VMF,the cell killing efficiency and tumor growth inhibition were further significantly improved by Fe_(3)O_(4)/CaO_(2)through CDT,magnetomechanical force,force-induced ROS,the cytotoxicity of Ca^(2+)ions.In addition,the Fe_(3)O_(4)/CaO_(2)nanoenzymes and VMFinduced treatment are shown to be safe for mice.The results of this study open the door for treating solid tumors without inducing multidrug resistance through the combination of CDT and force.

关键词： CaO_(2)-coated Fe_(3)O_(4)nanoenzymes magneto-mechanical force reactive oxygen species chemodynamic effect cancer therapy

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平屋面摩擦速度的数值模拟研究

工程力学 2024年第2期41卷 151-159页

作者：辛林桂周晅毅顾明同济大学土木工程防灾国家重点实验室上海200092

建筑屋面的摩擦速度是决定其风致迁移雪荷载的重要因素。该文采用CFD(computational fluid dynamics)方法模拟了平屋面的摩擦速度,并结合其分布特征分析了屋面积雪传输率、侵蚀通量和暴露系数随跨度的变化趋势。为验证CFD方法的湍流模... 详细信息

建筑屋面的摩擦速度是决定其风致迁移雪荷载的重要因素。该文采用CFD(computational fluid dynamics)方法模拟了平屋面的摩擦速度,并结合其分布特征分析了屋面积雪传输率、侵蚀通量和暴露系数随跨度的变化趋势。为验证CFD方法的湍流模型对平屋面摩擦速度模拟的影响,将数值模拟结果与Irwin探头风洞试验进行了对比,结果表明Realizable k-ε湍流模型的模拟结果与风洞试验最为接近。根据4种不同跨度屋面的CFD模拟结果发现,当屋面跨度与高度之比为4时,屋面平均摩擦速度最小;并且随着跨度的增大,屋面摩擦速度最小值所在的位置和积雪沉积的区域均逐渐向迎风侧屋檐靠近。同时发现,屋面积雪的平均侵蚀通量随着跨度的增大而减小,屋面积雪传输率和雪荷载暴露系数则随着跨度的增大而增大。

关键词：计算流体动力学(CFD) 平屋面 Irwin探头摩擦速度积雪传输率

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四种不同基质柑橘果醋的品质对比分析

中国调味品 2024年第5期49卷 156-160,165页

作者：孙盾薛桂新延边大学农学院吉林延吉133002

为了探究发酵基质对果醋品质的影响,以食用酒精发酵柑橘果醋(fermentation of citrus fruit vinegar with alcohol,FCFVA)、酒醋发酵柑橘果醋(wine vinegar ferments citrus fruit vinegar,WVFCFV)、酒汁发酵柑橘果醋(fermented citrus fruit vinegar with wine juice,FCFVWJ)、酒水发酵柑橘果醋(fermented citrus fruit vinegar with wine water,FCFVWW)4种不同发酵基质的果醋为实验原料,对比分析4种发酵基质果醋中的有机酸、氨基酸以及色度和透光率等品质指标。结果表明,发酵基质不同对柑橘果醋的有机酸、酚类物质、蛋白质和氨基酸含量以及色度、透光率都有显著性影响。4种柑橘果醋中,酒醋发酵柑橘果醋(wine vinegar ferments citrus fruit vinegar,WVFCFV)的有机酸和酚类物质含量显著高于其他3种果醋,食用酒精发酵柑橘果醋(fermentation of citrus fruit vinegar with alcohol,FCFVA)的蛋白质及TAA、EAA和NAA含量均高于其他3种果醋。

关键词：柑橘果醋发酵基质品质特性营养物质

Molecular docking-aided AIEgen design: concept, synthesis and applications

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Science China Chemistry 2024年第8期 2614-2628页

作者： Jian-Qing Zhang Xiao-Yu Xu Fu-Sheng Liu Shu-Qiang Cao Yu-xin gui Yi-Wen Su Xiao-Yu He Ji-Yuan Liang You-Quan Zou Department of Radiation and Medical Oncology Zhongnan Hospital of Wuhan University School of Pharmaceutical Sciences Wuhan University Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of Education Wuhan University Tai Kang Center for Life and Medical Sciences Wuhan University Department of Hepatobiliary & Pancreatic Surgery Zhongnan Hospital of Wuhan University

Aggregate-induced emission luminogens（AIEgens） have been widely used in biological imaging, chemical sensing, and disease treatments. The rational design and construction of AIEgens have received considerable research interests during the last few years. Herein, molecular docking-aided AIEgen design has been reasonably proposed and AIEgen TBQZY with excellent1O2generation ability has been synthesized. The newly developed TBQZY could efficiently kill S. epidermidis and methicillinresistant S. epidermidis（MRSE） by tightly binding to bacteria and triggering the accumulation of1O2in bacteria. TBQZY specifically regulated the immune system and polarized macrophages from M1 to M2 to accelerate the elimination of biofilm in vivo. In addition, healing acceleration was observed in chronic wounds treated with TBQZY, and side effects were negligible.Meanwhile, TBQZY had extraordinary potential for combating drug-resistant bacteria in the clinical setting. This research not only provided new concepts for the design of AIEgens, but also shed some lights on the discovery of drugs against drug-resistant bacteria.

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