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Robust Composite Separator Randomly Interwoven by PI and Pre-oxidized pan Nanofibers for High Performance Lithium-ion Batteries

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Chinese Journal of Polymer Science 2024年第11期42卷 1768-1779,I0012页

作者： Ying Li Chen pan feng Gan Zhi-Xun Lin Jin-Chao Yu Zhen-Zhen Wei Yan Zhao College of Textile and Clothing Engineering National Engineering Laboratory for Modern SilkSoochow UniversitySuzhou215123China College of Textile Science and Engineering Wuyi UniversityJiangmen529020China

Electrospun nanofibrous separators,despite lacking superior mechanical strength,have gained widespread attention with high porosity and facile ***,utilizing the fact that thermal imidization temperature of poly(amic acid)(PAA)into polyimide(PI)coincides with the pre-oxidation temperature of polyacrylonitrile(pan)into carbon fiber,we proposed a new cross-electrospinning strategy to obtain a composite nanofibrous separator(PI/opan)randomly interwoven by PI and pre-oxidized pan(opan)nanofibers,via synchronously electrospinning the PAA and pan onto the same collector and then heat-treating for 2 h at 300℃.The resultant PI/opan separator was able to preserve high porosity(71.7%),electrolyte wettability and thermal stability of PI nanofibrous membrane,and surprisingly exhibited high mechanical strength,being 3 times of PI,which mainly because of the numerous adhesion points generated by the melting of pan in the pre-oxidation ***,the polar groups of opan and 3D fibrous network enhanced the PI/opan separator's ionic conductivity and Li+transference number,rendering the corresponding cell with more stable cycling performance than cells assembled with pure PI,pan or commercial PP ***,this work might provide a new avenue for the ongoing design and further development of LIB separators capable of high safety and high performance.

关键词： Lithium-ion battery Nanofibrous separator Cross-electrospinning Polyimide Pre-oxidized polyacrylonitrile

A phase-selective,bis-urea organogelator with a curved bis-naphthalene core

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Chinese Chemical Letters 2017年第4期28卷 782-786页

作者： Huan Yao Liu-pan Yang Zhen-feng He jia-Rong Li Wei jiang School of Chemical Engineering and Environment Beijing Institute of Technology Department of Chemistry South University of Science and Technology of China Dalian Institute of Chemical Physics Chinese Academy of Science School of Chemical Engineering and Environment North University of China

A phase-selective,bis-urea organogelator with a curved bis-naphthalene core was synthesized and *** gelator is capable of gelating a variety of hydrocarbons and *** resulting gels have been characterized by rheology,SEM,and molecular *** gelator can be applied in the powder form for the recovery of a thin layer of petrol oil spill in water.

关键词： Organogelator Phase-selective Bis-naphthalene Supramolecular gel Oil spill recovery

Optimizing hardware-software co-design based on non-ideality in memristor crossbars for in-memory computing

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Science China(Information Sciences) 2025年

作者： Pinfeng jiaNG Danzhe SONG Menghua HUANG Fan YANG Letian WANG pan LIU Xiangshui MIAO Xingsheng WANG School of Integrated Circuits Huazhong University of Science and Technology Hubei Yangtze Memory Labs

The memristor crossbar, with its exceptionally high storage density and parallelism, enables efficient vector matrix multiplication (VMM), significantly improving data throughput and computational efficiency. However, its analog computing is vulnerable to issues like IR-drop, device-to-device (D2D) variation, and stuck-at-fault (SAF), leading to a substantial decrease in the inference accuracy of neural networks deployed on crossbars. This work presents a hardware-software co-design approach tailored to deal with memristor crossbar non-ideality. We introduce an end-to-end functional array simulator (FAST) for precise and ultra fast end-to-end training, mapping, and evaluation of neural networks on the memristor crossbar. Utilizing the sparsity of the memristor crossbar coefficient matrix, it achieves simulation with low storage and computational resource requirements,dynamically selecting the optimal solution to complete the process. It can also precisely simulate the impact of non-ideal effects such as IR-drop, retention, variation, SAF, and AD/DA precision. Using FAST, we assess memristor crossbar matrix operations under non-ideal conditions, identifying the max throughput and the most energy-efficient crossbar configurations. Additionally,we propose a comparator-based activation function modulation (CAFM) scheme and its corresponding hardware architecture with programmable activation function circuits to address the IR-drop issue, enabling low power and area overheads, resulting in the recovery of neural network accuracy by 54%or more. This is validated within FAST, demonstrating the success of our hardware-software optimization co-design.

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Bioactive materials from berberine-treated human bone marrow mesenchymal stem cells accelerate tooth extraction socket healing through the jaw vascular unit

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Science China Life Sciences 2025年

作者： Ruyu Wang Tianxiao Wang Ziyu Chen jiandong jiang Yifei Du Hua Yuan Yongchu pan Yuli Wang Department of Oral and Maxillofacial Surgery The Affiliated Stomatological Hospital of Nanjing Medical University State Key Laboratory Cultivation Base of Research Prevention and Treatment for Oral Diseases Jiangsu Province Engineering Research Centre of Stomatological Translational Medicine Nanjing Medical University Department of Stomatology Chongzhou People's Hospital Medical Basic Research Innovation Centre for Cardiovascular and Cerebrovascular Diseases Ministry of Education International Joint Laboratory for Drug Target of Critical Illnesses School of PharmacyNanjing Medical University Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences & Peking Union Medical College Department of Orthodontic The Affiliated Stomatological Hospital of Nanjing Medical University State Key Laboratory Cultivation Base of Research Prevention and Treatment for Oral Diseases Jiangsu Province Engineering Research Centre of Stomatological Translational Medicine Nanjing Medical University

Delayed tooth extraction socket(TES) healing can cause failure of subsequent oral implantation and increase socioeconomic burden on patients. Excessive amounts of M1 macrophages, apoptotic neutrophils(ANs), and neutrophil extracellular traps(NETs) impair alveolar bone regeneration during TES healing. In the present study, we first discovered that conditioned medium(CM) collected from berberine-treated human bone marrow mesenchymal stem cells(BBR-HB-CM) accelerated TES healing. BBR-HB-CM contained bioactive materials that promoted the polarization of macrophages from M1 to M2, impeded the formation of ANs and NETs, and modulated M2 macrophage efferocytosis in vivo and in vitro. Mechanistically, BBR-HB-CM promoted bone formation by inhibiting macrophage-myofibroblast transition and reprogrammed macrophage polarization through p85/AKT/mTOR pathway-dependent autophagy. The 3-methyladenine abolished the therapeutic effects of BBR-HB-CM. Further studies revealed that BBR-HB-CM accelerated TES healing in rats with type 2 diabetes mellitus. Overall, our results demonstrated that BBR-HB-CM had high potential to promote rapid TES healing.

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Interaction between geological body and structural body in a three-body model

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Journal of Central South University 2017年第12期24卷 2877-2893页

作者： YANG Sen ZHANG Nong KAN jia-guang feng Xiao-wei pan Dong-jiang ZHAO Qi-feng School of Mines China University of Mining and TechnologyXuzhou 221116China Safety Engineering College North China Institute of Science and TechnologyBeijing 101601China

A three-body model composed of two geological bodies and a structural body was developed to explore how ground-support systems respond to axial loads in underground spaces. A detailed method was designed to fabricate physical scale-model specimens for testing. Three types of specimens were constructed to investigate how three different materials reacted to each other under load. The three types of specimens were called the weak-rock model, hard-rock model and mixed model. The results of uniaxial compression tests show that the mechanical behaviour of a three-body structural support is closely related to the interaction between the three bodies, but owing to different mechanisms, the three types of material behave very differently. To explain the test results, numerical simulations were conducted to explore fully the load responses of the three-body model specimens. The numerical simulations verify the hypotheses proposed for how the three types of material interact.

关键词： three-body model interaction mechanism ground-support system uniaxial compression

Seismic performance of HWBBF considering different design methods and structural heights

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Frontiers of Structural and Civil Engineering 2023年第12期17卷 1849-1870页

作者： Yulong feng Zhi ZHANG Zuanfeng pan School of Civil Engineering Hefei University of TechnologyHefei 230009China Thornton Tomasetti New YorkNY 10271USA College of Civil Engineering Tongji UniversityShanghai 200092China

Previous research has shown that using buckling-restrained braces(BRBs)at hinged wall(HW)base(HWBB)can effectively mitigate lateral deformation of steel moment-resisting frames(MRFs)in *** and displacement-based design methods have been proposed to design HWBB to strengthen steel MRF and this paper comprehensively compares these two design methods,in terms of design steps,advantages/disadvantages,and structure *** addition,this paper investigates the building height below which the HW seismic moment demand can be properly ***,3-story,9-story,and 20-story steel MRFs in the SAC project are used as benchmark steel ***,HWs and HWBBs are designed to strengthen the benchmark steel MRFs using force-based and displacement-based methods,called HWFs and HWBBFs,***,nonlinear time history analyses are conducted to compare the structural responses of the MRFs,HWBBFs and HWFs in *** results show the following.1)HW seismic force demands increase as structural height increases,which may lead to uneconomical HW *** HW seismic moment demand can be properly controlled when the building is lower than nine stories.2)The displacement-based design method is recommended due to the benefit of identifying unfeasible component dimensions during the design process,as well as better achieving the design target displacement.

关键词： hinged wall moment-resisting frame seismic design displacement-based design nonlinear time-history analysis

Atomic/nano-scale in-situ probing the shuttling effect of redox mediator in Na-O_(2) batteries

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Journal of Energy Chemistry 2021年第5期30卷 438-443页

作者： Kai Yang Yiwei Li Langlang jia Yan Wang Zijian Wang YuChen jia Shichun Yang Magda Titirici Xinhua Liu Luyi Yang feng pan School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055GuangdongChina School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Department of Chemical Engineering Imperial College LondonLondon SW72AZUK

Sodium-oxygen batteries(Na-O_(2))have attracted extensive attention as promising energy storage systems due to their high energy density and low *** mediators are often employed to improve Na-O_(2) battery performance,however,their effect on the formation mechanism of the oxygen reduction product(NaO_(2))is still ***,we have investigated the formation mechanism of NaO_(2) during the discharge process in the presence of a redox mediator with the help of atomic/nano-scale in-situ characterization tools used in concert(*** force microscope,electrochemical quartz crystal microbalance(EQCM)and laser nano-particle analyzer).As a result,real-time observations on different time scales show that by shuttling electrons to the electrolyte,the redox mediator enables formation of NaO_(2) in the solution-phase instead of within a finite region near the electrode *** findings provide new fundamental insights on the understanding of Na-O_(2) batteries and new consequently perspectives on designing high performance metal-O_(2) batteries and other related functions.

关键词： Na-O_(2)battery In-situ AFM EQCM Redox mediator Shuttling effect

dCompaction： Speeding up Compaction of the LSM-Tree via Delayed Compaction

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Journal of Computer Science & Technology 2017年第1期32卷 41-54页

作者： feng-feng pan Yin-Liang Yue Jin Xiong State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China

Key-value （KV） stores have become a backbone of large-scale applications in today＇s data centers. Write- optimized data structures like the Log-Structured Merge-tree （LSM-tree） and their variants are widely used in KV storage systems like BigTable and RocksDB. Conventional LSM-tree organizes KV items into multiple, successively larger components, and uses compaction to push KV items from one smaller component to another adjacent larger component until the KV items reach the largest component. Unfortunately, current compaction scheme incurs significant write amplification due to repeated KV item reads and writes, and then results in poor throughput. We propose a new compaction scheme, delayed compaction （dCompaction） that decreases write amplification, dCompaction postpones some compactions and gathers them into the following compaction. In this way, it avoids KV item reads and writes during compaction, and consequently improves the throughput of LSM-tree based KV stores. We implement dCompaction on RocksDB, and conduct extensive experiments. Validation using YCSB framework shows that compared with RocksDB, dCompaction has about 40% write performance improvements and also comparable read performance.

关键词： key-value store Log-Structured Merge-tree (LSM-tree) write amplification delayed compaction

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金代经学与诗学关系研究

河南社会科学 2025年第1期33卷 111-117页

作者：潘链钰中南财经政法大学新闻与文化传播学院湖北武汉430073

金代经学与诗学发展紧密相关,具体表现在三个方面:一是在经学以儒为本的大纛下,诗学始终保持对风雅精神的传继。二是金源学者变汉宋经学本体之“道”为金源经学之“意”,发为“诚意”“己意”“中意”三端,促进了以意为主的诗学观之建... 详细信息

金代经学与诗学发展紧密相关,具体表现在三个方面:一是在经学以儒为本的大纛下,诗学始终保持对风雅精神的传继。二是金源学者变汉宋经学本体之“道”为金源经学之“意”,发为“诚意”“己意”“中意”三端,促进了以意为主的诗学观之建构。三是金源经学呈现出博采多元的格局,影响了诗学复古与创变两条路径的共同演进。

关键词：金代经学诗学