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Journal of Advanced Ceramics 2024年第3期13卷 263-271页

作者： Xuanyu Chen Ziqi Ma Bin Li Yejing Dai School of Materials Sun Yat-sen UniversityShenzhen 518107China

In this study,(Cr_(1/3)/Ta_(2/3))non-equivalent co-doped Bi_(4)Ti_(3)O_(12)(BIT)ceramics were prepared to solve the problem that high piezoelectric performance,high Curie temperature,and high-temperature resistivity could not be achieved simultaneously in BIT-based ceramics.A series of Bi_(4)Ti_(3-x)(Cr_(1/3)Ta_(2/3))_(x)O_(12)(x=0-0.04)ceramics were synthesized by the solid-state reaction *** phase structure,microstructure,piezoelectric performance,and conductive mechanism of the samples were systematically *** B-site non-equivalent co-doping strategy combining high-valence Ta^(5+)and low-valence Cr^(3+)significantly enhances electrical properties due to a decrease in oxygen vacancy ***_(4)Ti_(2.97)(Cr_(1/3)Ta_(2/3))_(0.03)O_(12)ceramics exhibit a high piezoelectric coefficient(d_(33)=26 pC·N^(-1))and a high Curie temperature(TC=687℃).Moreover,the significantly increased resistivity(ρ=2.8×10^(6)Ω·cm at 500℃)and good piezoelectric stability up to 600℃are also obtained for this *** the results demonstrate that Cr/Ta co-doped BIT-based ceramics have great potential to be applied in high-temperature piezoelectric applications.

关键词： high temperature piezoelectricity co-doped Bi_(4)Ti_(3)O_(12)(BIT)

Single-pixel 3D imaging based on fusion temporal data of single-photon detector and millimeter-wave radar

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Chinese Optics Letters 2024年第2期22卷 172-179页

作者：赖廷钦梁晓琳朱毅吴欣怡廖联烨袁雪林苏萍孙仕海 School of Electronics and Communication Engineering Sun Yat-sen UniversityShenzhen 518107China shenzhen Campus of sun yat-sen university Shenzhen 518107China Tsinghua shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China

Recently,there has been increased attention toward 3D imaging using single-pixel single-photon detection(also known as temporal data)due to its potential advantages in terms of cost and power ***,to eliminate the symmetry blur in the reconstructed images,a fixed background is *** paper proposes a fusion-data-based 3D imaging method that utilizes a single-pixel single-photon detector and millimeter-wave radar to capture temporal histograms of a scene from multiple ***,the 3D information can be reconstructed from the one-dimensional fusion temporal data by using an artificial neural *** the simulation and experimental results demonstrate that our fusion method effectively eliminates symmetry blur and improves the quality of the reconstructed images.

关键词： single-pixel imaging single-photon imaging millimeter-wave radar neural network

Boosting the cycling stability of all-solid-state lithium metal batteries through MOF-based polymeric protective layers

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Journal of Energy Chemistry 2024年第8期95卷 511-518,I0011页

作者： Hongfei Bao Diancheng Chen Jiaqi Cao Pengfeng Jiang Kaili Li Runtao Liu Yuling Zhao Yichun Zheng Beiqi Liao Yaming Zhang Xia Lu Yang sun School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107GuangdongChina

Solid-state electrolytes(SSEs)play a pivotal role in advancing next-generation lithium metal battery ***,they commonly encounter substantial interfacial resistance and poor stability when interfacing with lithium metal,hindering practical ***,we introduce a flexible metal-organic framework(MOF:NUS-6)-incorporated polymeric layer,denoted as NP,designed to protect the sodium superionic conductor(NASICON)-type Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)electrolyte from Li metal *** NP matrix establishes a soft interface with the LATP surface,effectively reducing voids and gaps that may arise between the LATP electrolyte and Li ***,the MOF component in NP enhances ionic conductivity,offers abundant Li^(+)transport sites,and provides hierarchical ion channels,ensuring a homogeneous Li^(+)flow and thus effectively inhibiting Li dendrite *** NP,we fabricate Li symmetrical cells cycled for over 1600 h at 0.2 mA cm^(-2)and all-solid-state LiINP-LATPI LiFePO_(4)batteries,achieving a remarkable 99.3%capacity retention after 200 cycles at 0.2 *** work outlines a general strategy for designing long-lasting and stable solid-state Li metal batteries.

关键词： All-solid-state Li metal battery MOF-based polymeric layer Li dendrite Interfacial contact LATP electrolyte stability

research on Pulsar Time Steered Atomic Time Algorithm Based on DPLL

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research in Astronomy and Astrophysics 2024年第3期24卷 237-248页

作者： Ze-Hao Zheng Yang Liu Dan Shen Fan Feng Jiu-Long Liu Yue-Xin Ma Xiang-Wei Zhu School of Electronic and Communication Engineering Sun Yat-sen UniversityShenzhen 518107China School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518107China School of Systems Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China

In today’s society,there is a wide demand for high-precision and high-stability time service in the fields of electric power,communication,transportation and *** present,the time standard in various countries is mainly based on atomic clocks,but the frequency drift of atomic clocks will affect the long-term stability *** with atomic clocks,millisecond pulsars have better long-term stability and can complement with the excellent short-term stability of atomic *** order to improve the long-term stability of the atomic timescale,and then improve the timing accuracy,this paper proposes an algorithm for steering the atomic clock ensemble(ACE)by ensemble pulsar time(EPT)based on digital phase locked loop(DPLL).First,the ACE and EPT are generated by the ALGOS algorithm,then the ACE is steered by EPT based on DPLL to calibrate the long-term frequency drift of the atomic clock,so that the generated steered atomic time follows both the short-term stability characteristics of ACE and the long-term stability characteristics of EPT,and finally,the steered atomic time is used to calibrate the local cesium *** experimental results show that the long-term stability of atomic time after steering is improved by 2 orders of magnitude compared with that before steering,and the daily drift of a local cesium clock after calibration is less than 9.47 ns in 3 yr,3 orders of magnitude higher than that before calibration on accuracy.

关键词： (stars) pulsars general-time-methods data analysis-instabilities

Adaptive neural dynamic-based hybrid control strategy for stable retrieval of tethered satellite systems

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Astrodynamics 2024年第2期8卷 261-269页

作者： Zhixiong Ji Gefei Shi School of Aeronautics and Astronautics Sun Yat-sen UniversityGuangzhou 510275China shenzhen Campus of sun yat-sen university Shenzhen 518107China shenzhen Key Laboratory of Intelligent Microsatellite Constellation Shenzhen 518107China

This study proposes a novel adaptive neural dynamic-based hybrid control strategy for stable subsatellite retrieval of two-body tethered satellite *** retrieval speed is given analytically,ensuring a libration-free steady *** mitigate the potential libration motion,a general control input signal is generated by an adaptive neural-dynamic(AND)algorithm and executed by adjusting the retrieval speed and thruster on the *** address the limited retrieval speed and improve the control performance,the thruster controller is manipulated according to a novel advanced state fuzzy control law based on higher-order libration states,whereas the remaining control input is allocated to the speed *** Lyapunov stability of the control strategy is demonstrated *** simulations validate the proposed control strategy,demonstrating well-allocated control inputs for both controllers and good control performance.

关键词： tethered satellite system(TSS) stable retrieval hybrid control adaptive neural-dynamic (AND)control fuzzy control

A Rendezvous Mission to the Second Earth Trojan Asteroid 2020 XL_5 with Low-Thrust Multi-Gravity Assist Techniques

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research in Astronomy and Astrophysics 2024年第1期24卷 245-264页

作者： Shi-Hai Yang Bo Xu Xin Li School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518107China

As the second of Earth's Trojan asteroids, 2020 XL_(5) is worthy of rendezvous and even sample return missions in many aspects. In this paper, a rendezvous mission to Earth's second Trojan asteroid 2020 XL_(5) is ***, due to its high inclination and large eccentricity, direct impulsive transfer requires large amounts of fuel consumption. To address this challenge, we explore the benefits of electric propulsion and multi-gravity assist techniques for interplanetary missions. These two techniques are integrated in this mission design. The design of a low-thrust gravity-assist(LTGA) trajectory in multi-body dynamics is thoroughly investigated,which is a complex process. A comprehensive framework including three steps is presented here for optimization of LTGA trajectories in multi-body dynamics. The rendezvous mission to 2020 XL_(5) is designed with this three-step approach. The most effective transfer sequence among the outcomes involves Earth–Venus–Earth–Venus-2020 XL_(5). Numerical results indicate that the combination of electric propulsion and multi-gravity assists can greatly reduce the fuel consumption, with fuel consumption of 9.03%, making it a highly favorable choice for this rendezvous mission.

关键词： minor planets asteroids:general celestial mechanics Planetary Systems

Inflammatory Factor IL1αInduces Aberrant Astrocyte Proliferation in Spinal Cord Injury Through the Grin2c/Ca^(2+)/CaMK2b Pathway

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Neuroscience Bulletin 2024年第4期40卷 421-438页

作者： Yu Xia Lu Ding Changlin Zhang Qi Xu Ming Shi Tianshun Gao Feng-Quan Zhou David Y.B.Deng Scientific research Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China Department of Gynecology The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China Pelvic Floor Disorders Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China Big Data Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China Sir Run Run Shaw Hospital Zhejiang University School of MedicineHangzhou310016China Orthopaedic and Neurological Repair Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China

Spinal cord injury(SCI)is one of the most devastating traumas,and the aberrant proliferation of astrocytes usually causes neurological ***,the mechanism underlying astrocyte over-proliferation after SCI is ***2c(glutamate ionotropic receptor type 2c)plays an essential role in cell *** bioinformatic analysis indicated that Grin2c and Ca^(2+)transport functions were inhibited in astrocytes after *** of Grin2c stimulated astrocyte proliferation by inhibiting the Ca^(2+)/calmodulin-dependent protein kinase 2b(CaMK2b)pathway in *** screening different inflammatory factors,interleukin 1α(IL1α)was further found to inhibit Grin2c/Ca^(2+)/CaMK2b and enhance astrocyte proliferation in an oxidative damage *** of IL1αusing neutralizing antibody resulted in increased Grin2c expression and the inhibition of astrocyte proliferation ***,this study suggests that IL1αpromotes astrocyte proliferation by suppressing the Grin2c/Ca^(2+)/CaMK2b pathway after SCI,revealing a novel pathological mechanism of astrocyte proliferation,and may provide potential targets for SCI repair.

关键词： IL1α Grin2c Astrocyte Spinal cord injury

Non-Hermitian CHSH^(*)Game with a Single Trapped-Ion Qubit

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Chinese Physics Letters 2024年第6期41卷 1-10页

作者：宋潇刘腾边纪陆鹏飞刘泱朱峰罗乐 School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China shenzhen research institute of sun yat-sen university Shenzhen 518057China Quantum Science Center of Guangdong-HongKong-Macao Greater Bay Area Shenzhen 518048China Guangdong Provincial Key Laboratory of Quantum Metrology and sensing Zhuhai 519082China

The Clauser-Horne-Shimony-Holt(CHSH)game provides a captivating illustration of the advantages of quantum strategies over classical *** a recent study,a variant of the CHSH game leveraging a single qubit system,referred to as the CHSH^(*)game,has been *** demonstrate that this mapping relationship between these two games remains effective even for a non-unitary *** we delve into the breach of Tsirelson’s bound in a non-Hermitian system,predicting changes in the upper and lower bounds of the player’s winning probability when employing quantum strategies in a single dissipative qubit *** experimentally explore the impact of the CHSH^(*)game on the player’s winning probability in a single trapped-ion dissipative system,demonstrating a violation of Tsirelson’s bound under the influence of parity-time(PT)*** results contribute to a deeper understanding of the influence of non-Hermitian systems on quantum games and the behavior of quantum systems under PT symmetry,which is crucial for designing more robust and efficient quantum protocols.

关键词： quantum system dissipative

Epigenetic and transcriptional landscapes during cerebral cortex development in a microcephaly mouse model

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Journal of Genetics and Genomics 2024年第4期51卷 419-432页

作者： Qing Yang Qiang Cao Yue Yu Xianxin Lai Jiahao Feng Xinjie Li Yinan Jiang Yazhou sun Zhong-Wei Zhou Xin Li School of Medicine Shenzhen Campus of Sun Yat-sen UniversityShenzhenGuangdong 518107China Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjin 300072China Scientific research Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhenGuangdong 518107China Guangdong Provincial Key Laboratory of Digestive Cancer research The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhenGuangdong 518107China

The cerebral cortex is a pivotal structure integral to advanced brain functions within the mammalian central nervous *** methylation and hydroxymethylation play important roles in regulating cerebral cortex ***,it remains unclear whether abnormal cerebral cortex development,such as microcephaly,could rescale the epigenetic landscape,potentially contributing to dysregulated gene expression during brain *** this study,we characterize and compare the DNA methylome/hydroxymethylome and transcriptome profiles of the cerebral cortex across several developmental stages in wild-type(WT)mice and Mcph1 knockout(Mcph1-del)mice with severe ***,we discover a global reduction of 5′-hydroxymethylcytosine(5hmC)level,primarily in TET1-binding regions,in Mcph1-del mice compared to WT mice during juvenile and adult ***,genes exhibiting diminished 5hmC levels and concurrently decreased expression are essential for neurodevelopment and brain ***,genes displaying a delayed accumulation of 5hmC in Mcph1-del mice are significantly associated with the establishment and maintenance of the nervous system during the adult *** findings reveal that aberrant cerebral cortex development in the early stages profoundly alters the epigenetic regulation program,which provides unique insights into the molecular mechanisms underpinning diseases related to cerebral cortex development.

关键词： Microcephaly Epigeneticmodification Tet1 Cerebral cortexdevelopment DNA hydroxymethylome Transcriptome

Method for detector description conversion from DD4hep to Filmbox

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Nuclear Science and Techniques 2024年第9期35卷 115-126页

作者： Zhao-Yang Yuan Tian-Zi Song Yu-Jie Zeng Kai-Xuan Huang Yu-Mei Zhang Zheng-Yun You School of Physics Sun Yat-sen UniversityGuangzhou 510275China Sino-French institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

DD4hep serves as a generic detector description toolkit recommended for offline software development in next-generation high-energy physics(HEP)***,Filmbox(FBX)stands out as a widely used 3D modeling file format within the 3D software *** this paper,we introduce a novel method that can automatically convert complex HEP detector geometries from DD4hep description into 3D models in the FBX *** feasibility of this method was dem-onstrated by its application to the DD4hep description of the Compact Linear Collider detector and several sub-detectors of the super Tau-Charm facility and circular electron-positron collider *** automatic DD4hep–FBX detector conversion interface provides convenience for further development of applications,such as detector design,simulation,visualization,data monitoring,and outreach,in HEP experiments.

关键词： Detector description DD4hep FBX Geometry Offline software