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CPT: a pre-trained unbalanced transformer for both Chinese language understanding and generation

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Science China(Information Sciences) 2024年第5期67卷 43-55页

作者： Yunfan SHAO Zhichao GENG yitao liu Junqi DAI Hang YAN Fei YANG Zhe LI Hujun BAO Xipeng QIU School of Computer Science Fudan University Shanghai Key Laboratory of Intelligent Information Processing Fudan University Zhejiang Lab

In this paper, we take the advantage of previous pre-trained models(PTMs) and propose a novel Chinese pre-trained unbalanced transformer(CPT). Different from previous Chinese PTMs, CPT is designed to utilize the shared knowledge between natural language understanding(NLU) and natural language generation(NLG) to boost the performance. CPT consists of three parts: a shared encoder, an understanding decoder, and a generation decoder. Two specific decoders with a shared encoder are pretrained with masked language modeling(MLM) and denoising auto-encoding(DAE) tasks, *** the partially shared architecture and multi-task pre-training, CPT can(1) learn specific knowledge of both NLU or NLG tasks with two decoders and(2) be fine-tuned flexibly that fully exploits the potential of the model. Moreover, the unbalanced transformer saves the computational and storage cost, which makes CPT competitive and greatly accelerates the inference of text generation. Experimental results on a wide range of Chinese NLU and NLG tasks show the effectiveness of CPT.

关键词： pre-trained model transformer language model generation unified model

Planar Magnetic Integrated Harmonic Filter with Reduced EMI Noise

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Chinese Journal of Electrical Engineering 2022年第3期8卷 49-56页

作者： Zijian Lu Tianhao Chen yitao liu College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China

Through the analysis of the circuit structure and electromagnetic interference(EMI)conduction path,the structure of the traditional harmonic filter is optimized so that it has the ability to suppress *** the structure of planar magnetic integration not only ensures the basic harmonic suppression ability of the harmonic filter,but also improves the EMI suppression *** a single-phase voltage source 500-W SiC inverter as the platform,the feasibility and effectiveness of the design scheme are experimentally *** results indicated that the planar magnetic integrated harmonic EMI filter satisfies the design ***,the proposed planar magnetic integration scheme can significantly reduce the volume and weight of the filter and increase the power density of the entire system.

关键词： Planar magnetic integration EMI filter harmonic filter voltage-source inverter

GO/PVA nanocomposites with significantly enhanced mechanical properties through metal ion coordination

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Chinese Chemical Letters 2019年第5期30卷 1100-1104页

作者： Chen Lin yitao liu Xuming Xie Key Laboratory of Advanced Materials (MOE) Department of Chemical Engineering Tsinghua University

In this study,a simple and efficient way is demonstrated to create strong interfacial interaction between graphene oxide(GO)filler and poly(vinyl alcohol)(PVA)matrix through metal ion *** coordination bonding provides efficient load transfer during the tensile process,and enhances the mechanical properties of the nanocomposites *** being coordinated with Cu(Ⅱ)ions,GO/PVA composites show much higher Young’s moduli and yield stresses than pure PVA and noncoordinated GO/***–vis and FTIR spectra are performed to confirm the successful coordination between GO and *** diamine tetraacetic acid disodium salt(EDTA-2 Na)is used to confirm the important role of coordination in enhancing the *** research provides a new approach to manufacture polymer-matrix nanocomposites with significantly improved mechanical performances.

关键词： Graphene oxide PVA Coordination Composite Mechanical property

Multi-dimensionally ordered, multi-functionally integrated r-GO@TiO2（B）@Mn304 yolk-membranc shell superstructures for ultrafast lithium storage

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Nano Research 2016年第7期9卷 2057-2069页

作者： Long Pan yitao liu Xuming Xie Xiongying Ye Xiaodong Zhu Key Laboratory of Advanced Materials (MOE) Department of Chemical Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing 100084 China Academy of Fundamental and In terdisciplinary Sciences Harbin Institute of Technology Harbin 150080 China

TiO2（B） is an attractive new anode candidate for lithium-ion batteries （LIBs） due to its unique and highly desirable properties, including high structural integrity, long cycle life, and low cost. However, despite these merits, its inherent slow lithium and electron transport kinetics hinder its practical application to LIBs. Here, we propose a novel, simple route towards multi-dimensionally ordered, multi-functionally integrated reduced graphene oxide （r-GO）@TiO2（B）@Mn304 yolk-membrane-shell superstructures in which r-GO nanosheets, TiO2（B） nanosheets, and Mn304 nanoparticles are hierarchically organized to achieve remarkable synergistic interactions. This hybridization design is fundamentally bilateral in nature, aiming to overcome the conductivity and capacity deficiencies of TiO2（B） simultaneously. The resulting r-GO@TiO2（B）@Mn304 yolk-membrane- shell superstructures have great potential as advanced anode materials for ultrafast lithium storage, delivering a strikingly high reversible capacity of 662 mA.h-g-1 at 500 mA-g^-1 after 500 charge-discharge cycles.

关键词： yolk-membrane-shellsuperstructure TiO2(B) Mn3O4 reduced graphene oxide lithium-ion battery

g-C_(3)N_(4) encapsulated ZrO_(2) nanofibrous membrane decorated with CdS quantum dots: A hierarchically structured, self-supported electrocatalyst toward synergistic NH3 synthesis

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Nano Research 2021年第5期14卷 1479-1487页

作者： Jun Song Jin Dai Peng Zhang yitao liu Jianyong Yu Bin Ding Key Laboratory of Textile Science&Technology(Donghua University) Ministry of EducationInnovation Center for Textile Science and TechnologyDonghua UniversityShanghai200051China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng224051China College of Textiles Donghua UniversityShanghai201620China State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou450001China

The advancement of electrocatalytic N2 reduction reaction (NRR) toward ambient NH3 synthesis lies in the development of more affordable electrocatalysts than noble metals. Recently, various nanostructures of transition metal compounds have been proposed as effective electrocatalysts;however, they exist in the form of loose powders, which have to be immobilized on a matrix before serving as the electrode for electrolysis. The matrix, being it carbon paper, carbon cloth or metal foam, is electrocatalytically inactive, whose introduction inevitably raises the invalid weight while sacrificing the active sites of the electrode. Herein, we report on the fabrication of a flexible ZrO2 nanofibrous membrane as a novel, self-supported electrocatalyst. The heteroatom doping can not only endow the nanofibrous membrane with excellent flexibility, but also induce oxygen vacancies which are responsible for easier adsorption of N2 on the ZrO2 surface. To improve the electrocatalytic activity, a facile SILAR approach is employed to decorate it with CdS quantum dots (QDs), thereby tuning its Fermi level. To improve the conductivity, a g-C3N4 nanolayer is further deposited which is both conductive and active. The resulting hierarchically structured, self-supported electrocatalyst, consisting of g-C3N4 encapsulated ZrO2 nanofibrous membrane decorated with CdS QDs, integrates the merits of the three components, and exhibits a remarkable synergy toward NRR. Excellent NH3 yield of 6.32 × 10−10 mol·s−1cm−2 (−0.6 V vs. RHE) and Faradaic efficiency of 12.9% (−0.4 V vs. RHE) are attained in 0.1 M Na2SO4.

关键词： ZrO_(2)nanofibrous membrane CdS quantum dots g-C_(3)N_(4)nanolayer self-supported electrocatalyst NH_(3)synthesis

From sand to fast and stable silicon anode:Synthesis of hollow Si@void@C yolk-shell microspheres by aluminothermic reduction for lithium storage

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Chinese Chemical Letters 2019年第3期30卷 610-617页

作者： Zhengwei Zhou Long Pan yitao liu Xiaodong Zhu Xuming Xie Key Laboratory of Advanced Materials (MOE) Department of Chemical Engineering Tsinghua University Innovation Center for Textile Science and Technology Donghua University Academy of Fundamental and Interdisciplinary Sciences Harbin Institute of Technology

As an alloying type anode material, silicon is a promising alternative of graphitic carbon due to its high theoretical capacity and natural abundance. Developing an industrially viable silicon anode, however, is still a huge challenge because of several problems: First of all, the common process to synthesize a silicon anode is complicated, costly, and energy-intensive. Besides, the huge volume expansion, inevitable side reactions with the electrolyte, and low intrinsic conductivity of silicon are eventually responsible for the poor cyclability and unsatisfactory rate capability. Herein, we aim to address these issues by proposing synthesis of hollow Si@void@C yolk-shell microspheres from sand by low-temperature aluminothermic reduction, which energetically combines a cost-effective silicon source with an energy-efficient, highyield methodology. The hollow Si@void@C yolk-shell microspheres effectively accommodate the diffusion-induced stress by providing the hollow interior and the void space. Moreover, the carbon shell not only functions as an electrolyte-blocking layer to protect the silicon yolk from undesirable side reactions and SEI formation, but also acts as a conductive framework to reduce the resistance to electron and Li^+ ion transport. Benefiting from these synergistic effects, the hollow Si@void@C yolk-shell microspheres exhibit superior long-term cyclability and rate capability.

关键词： Sand Anode Lithium storage Aluminothermic reduction Si@void@C yolk-shell microspheres

Vacancy-enhanced Mo-N_(2) interaction in MoSe_(2) nanosheets enables efficient electrocatalytic NH_(3) synthesis

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Chinese Chemical Letters 2023年第1期34卷 474-477页

作者： Shuhong Wu Meng Zhang Shengmei Huang Lihai Cai Dannong He yitao liu School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China National Engineering Research Center for Nanotechnology Shanghai 200240China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 200051China Institute of Systems Engineering Academy of Military SciencesBeijing 102300China

NH_(3) plays an essential role in human life since it is an important raw material for fertilizers,plastics and rubbers *** an NH_(3) synthesis technology under ambient conditions,electrocatalytic N_(2) reduction reaction(NRR)has great potential to replace the energy-intensive Haber-Bosch *** key of electrocatalytic NRR is the exploration of efficient *** metal Mo is promising since it exists naturally in nitrogenase due to the unique Mo-N_(2) interaction;particularly in the form of 2D material such as MoSe_(2),the surface area is maximized for more active ***,the NRR performance of MoSe_(2) is still unsatisfactory because Mo is only exposed at the semi-open edge,and the electronegative Se-mantled surface area remains inaccessible to N_(2).Herein,we propose a simple and effective strategy to create high-concentration Se vacancies in MoSe_(2) through heteroatom doping induced lattice strain,which effectively enhances the Mo-N_(2) interaction on the surface *** result,high NH_(3) yield(3.04×10^(–10)mol s^(–1)cm^(–2))and Faraday efficiency(21.61%)are attained at–0.45 V *** in 0.1 mol/L Na_(2)SO_(4).

关键词： MoSe_(2)nanosheets Doping Se vacancies Mo-N_(2)interaction Electrocatalysis NH_(3)synthesis

Smart Interfacing between Co-Fe Layered Double Hydroxide and Graphitic Carbon Nitride for High-efficiency Electrocatalytic Nitrogen Reduction

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Energy & Environmental Materials 2023年第2期6卷 62-69页

作者： Xiaohui Wu Lu Tang Yang Si Chunlan Ma Peng Zhang Jianyong Yu yitao liu Bin Ding Key Laboratory of High Performance Fibers&Products(Ministry of Education) College of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 200051China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Bimetallic compounds such as hydrotalcite-type layered double hydroxides(LDHs)are promising electrocatalysts owing to their unique electronic ***,their abilities toward nitrogen adsorption and reduction are undermined since the surface-mantled,electronegative-OH groups hinder the charge transfer between transition metal atoms and nitrogen ***,a smart interfacing strategy is proposed to construct a coupled heterointerface between LDH and 2D g-C_(3)N_(4),which is proven by density functional theory(DFT)investigations to be favorable for nitrogen adsorption and ammonia desorption compared with neat LDH *** interfaced LDH and g-C_(3)N_(4) is further hybridized with a self-standing TiO_(2) nanofibrous membrane(NM)to maximize the interfacial effect owing to its high porosity and large surface *** from the synergistic superiorities of the three components,the LDH@C_(3)N_(4)@TiO_(2) NM delivers superior ammonia yield(2.07×10^(−9) mol s^(−1) cm^(−2))and Faradaic efficiency(25.3%),making it a high-efficiency,noble-metal-free catalyst system toward electrocatalytic nitrogen reduction.

关键词： density functional theory electrocatalytic nitrogen reduction graphitic carbon nitride interface engineering layered double hydroxide

Assessment of the distribution and volume of air chambers around the inner auditory canal on high-resolution computed tomography scans of the temporal bone

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Chinese Medical Journal 2023年第11期136卷 1379-1381页

作者： Xinping Hao yitao liu Ying Shi Biao Chen Bentao Yang Yunfu liu Yongxin Li Department of Otorhinolaryngology Head and Neck SurgeryBeijing Tongren HospitalCapital Medical UniversityBeijing 100730China Department of Radiology Beijing Tongren HospitalCapital Medical UniversityBeijing 100730China

To the Editor:Acoustic neuroma is the most common tumor in the cerebellopontine angle(CPA)*** surgical approaches used for acoustic neuroma include the labyrinth,middle cranial fossa,posterior sigmoid sinus,and posterior labyrinth ***,regardless of the approach used to expose the tumor in the internal auditory canal(IAC),the bone around the IAC must be abraded,which inevitably exposes the surrounding air cells to damage and increases the risk of cerebrospinal fluid(CSF)leak after surgery.

关键词： auditory damage surgery