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| 1 | Dynamically reconfigurable topological edge state in phase change photonic crystals显示文摘The observation of topological edge states(TESs) revolutionized our understanding of scattering and propagation of electromagnetic(EM) waves. Supported by topological robustness, the TES at the interface between trivial and non-trivial insulators was not reflected from the structural disorders and imperfections. Recently topological photonic crystals(PhCs) were demonstrated to obtain remarkable one-way propagation of the TES, having the advantages of lossless propagation, dense integration, and high fabrication tolerance over conventional PhCs. Nevertheless, the lack of reversible switching of TES possesses significant limitations in helicity/spin filtering and tunable photonic devices. We proposed a topological PhC based on a prototypical phase-change material, Ge2 Sb2 Te5(GST225) to solve the problem. We find that at a particular frequency, the TES within the structure can be reversibly switched between 'on'and 'off' by transiting the GST225 structural state between amorphous and crystalline. Moreover, the topology of the PhC was maintained since the tuning of TES was achieved by varying the refractive index of GST225 instead of the structural geometry. This provides a continuous change of the spectral position of the photonic bandgap and TES by gradually crystallising the GST225. We show that the phase change of GST225 from amorphous to crystalline and vice versa can be engineered in nanoseconds. Our proof of concept may offer a platform for dynamically tuning the TESs that might otherwise be challenging to attain in photonic systems. We expect it to have potential applications for photonic devices in topological optical circuits and scatter-free one-way light propagation. | Tun Cao Linhan Fang Ying Cao Nan Li Zhiyou Fan Zhiguo Tao | 2019 | Science Bulletin2019，64，12： | 8 |
| 2 | Microstructure-based hot extrusion process control principles for nickel-base superalloy pipes显示文摘The properties of nickel-base superalloy pipes are determined by microstructure, and the microstructure can be tuned by hot extrusion process. There are two major questions in hot extrusion: one is how to successfully extrude pipes without apparent defects, the other is how to make the microstructure under control. However, up to now, there is no systematical report about hot extrusion process and microstructure control for nickel-base superalloys. In present study, a series of technical control principles for hot extrusion are proposed basing on practical manufacture facts, large amounts of experimental studies and finite element simulation of several typical nickel-base superalloys. The common used technical control principles can be applied for hot extrusion parameters determination to maintain safety hot extrusion and microstructure control. In the investigation of microstructure control based hot extrusion principles, the action rules of different working parameters on hot extrusion field quantities were established. The upper and lower limits of different principles were obtained in consideration of materials characteristics and extruder conditions. The limitations were overlapped on the action rules to determine the optimized hot extrusion parameters. The microstructure-based control principle proposed in present work can provide theoretical guidance for hot extrusion parameter determination and optimization. | He Jiang Linhan Li Jianxin Dong Xishan Xie | 2018 | Progress in Natural Science:Materials International2018，28，3： | 4 |
| 3 | Designing artificial ion channels with strict K^(+)/Na^(+)selectivity toward next-generation electric-eel-mimetic ionic power generation显示文摘A biological potassium channel is>1000 times more permeable to K^(+)than to Na^(+)and exhibits a giant permeation rate of~10^(8)ions/s.It is a great challenge to construct artificial potassium channels with such high sele ctivity and ion conduction rate.Herein,we unveil a long-overlo oked structural feature that underpins the ultra-high K^(+)/Na^(+)selectivity.By carrying out massive molecular dynamics simulation for ion transport through carbonyl-oxygen-modified bi-layer graphene nanopores,we find that the twisted carbonyl rings enable strict potassium selectivity with a dynamic K^(+)/Na^(+)selectivity ratio of 1295 and a K^(+)conduction rate of 3.5×10^(7)ions/s,approaching those of the biological counterparts.Intriguingly,atomic trajectories of K^(+)permeation events suggest a dual-ion transport mode,i.e.two like-charged potassium ions are successively captured by the nanopores in the graphene bi-layer and are interconnected by sharing one or two interlayer water molecules.The dual-ion behavior allows rapid release of the exiting potassium ion via a soft knock-on mechanism,which has previously been found only in biological ion channels.As a proof-of-concept utilization of this discovery,we propose a novel way for ionic power generation by mixing KCl and NaCl solutions through the bi-layer graphene nanopores,termed potassium-permselectivity enabled osmotic power generation(PoPee-OP G).Theoretically,the biomimetic device achieves a very high power density of>1000 W/m^(2)with graphene sheets of<1%porosity.This study provides a blueprint for artificial potassium channels and thus paves the way toward next-generation electric-eel-mimetic ionic power generation. | Jipeng Li Linhan Du Xian Kong Jianzhong Wu Diannan Lu Lei Jiang Wei Guo | 2023 | National Science Review2023，10，12： | 0 |
| 4 | Application of Quicksort Algorithm in Information Retrieval显示文摘With the development and progress of today’s network information technology,a variety of large-scale network databases have emerged with the situation,such as Baidu Library and Weipu Database,the number of documents in the inventory has reached nearly one million.So how do you quickly and effectively retrieve the information you want in such a huge database?This requires finding efficient algorithms to reduce the computational complexity of the computer during Information Retrieval,improve retrieval efficiency,and adapt to the rapid expansion of document data.The Quicksort Algorithm gives different weights to each position of the document,and multiplies the weight of each position with the number of matches of that position,and then adds all the multiplied sums to set a feature value for Quicksort,which can achieve the full accuracy of Information Retrieval.Therefore,the purpose of this paper is to use the quick sort algorithm to increase the speed of Information Retrieval,and to use the position weighting algorithm to improve the matching quality of Information Retrieval,so as to achieve the overall effect of improving the efficiency of Information Retrieval. | Jiajun Xie Zuyan Li Han Wu Linhan Li Bin Pan Peng Guo Guang Sun | 2021 | Journal on Big Data2021，3，4： | 0 |
| 5 | Evaluation on ChatGPT for Chinese Language Understanding显示文摘ChatGPT has attracted extension attention of academia and industry.This paper aims to evaluate ChatGPT in Chinese language understanding capability on 6 tasks using 11 datasets.Experiments indicate that ChatGPT achieved competitive results in sentiment analysis,summary,and reading comprehension in Chinese,while it is prone to factual errors in closed-book QA.Further,on two more difficult Chinese understanding tasks,that is,idiom fill-in-the-blank and cants understanding,we found that a simple chain-of-thought prompt can improve the accuracy of ChatGPT in complex reasoning.This paper further analyses the possible risks of using ChatGPT based on the results.Finally,we briefly describe the research and development progress of our ChatBIT. | Linhan Li Huaping Zhang Chunjin Li Haowen You Wenyao Cui | 2023 | Data Intelligence2023，5，4： | 0 |
| 6 | Dynamics and cytokinic regulation of immune cell infiltration in genetically engineered mouse models of pancreatic cancer dictate the sensitivity to immunotherapy显示文摘Dear Editor,Targeting the immune compartment in pancreatic duc-tal adenocarcinoma(PDAC)holds promise for prognostic improvement,yet our knowledge on the spatial and tem-poral dynamics and the molecular modulators of the PDAC-associated immunophenotype is scarce. | Okan Safak Shenghan Wang Carmen Mota Reyes Ibrahim Halil Gürcinar Sergey Tokalov Nedim Can Cevik Kivanc Görgülü Bengi Su Yilmaz Emre Erdogan Linhan Ye Qiaolin Li Elif Arik Sever SamedÖzer Güldal Süyen Helmut Friess Güralp Onur Ceyhan Rouzanna Istvanffy Hana Algül Ihsan Ekin Demir | 2024 | Cancer Communications2024，44，1： | 0 |
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