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Rare Metals 2024年第6期43卷 2747-2757页

作者： xi-di sun Jun-Yang An Yi-Qi sun xin Guo Jing Wu Jiang-Bo Hua Meng-Rui Su Yi Shi Li-Jia Pan Collaborative Innovation Center of Advanced Microstructures School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China

Stretchable electronics that monitor joint activity and treat diseases based on liquid metal could be used in the development of healthcare *** devices can be seamlessly integrated with human ***,most high-precision microstructures and complex patterns are difficult to fabricate due to the limitations of conventional fabrication solutions,resulting in suboptimal performance under practical ***,a liquid-metal stretchable system utilizing natural leaf veins was reported as microstructures,which was based on a biomimetic concept and utilized an all-solution process for the preparation of complex *** systems are ultra-high tensile(800%tensile strain),environmentally stable(20 days)and mechanically durable(300-cycle).The system can accurately recognize the wearer's finger bending level as well as simple gesture *** the same time,the system acts as a wearable heater,which can realize the fast heating behavior of heating up to 50℃in 3 min under the human body-safe voltage(1.5 V).The tensile stability is demonstrated by the heterogeneous integration of lasers(405 nm)with the system interconnects for a stretchable and wearable light source.

关键词： Stretchable electronics Liquid metal Stretchable conductor Vein Bionicist electronics

Tunable structural coloration of ultrathin zirconia nanotubes film

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Rare Metals 2023年第10期42卷 3304-3310页

作者： xi-di sun Hui-Wen Yu Cheng-Yan Zhao Jing Zhang Yi Shi Li-Jia Pan Collaborative Innovation Center of Advanced Microstructures School of Electronic Science and EngineeringNanjing UniversityNanjing210093China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083China

Zirconium(Zr) is a rare metal widely used in aero space and military ***,its single color does not meet the requirements of camouflage and ***,a series of ultrathin structural colorations of Zr by coating it with a on... 详细信息

关键词： structural film coating

A new study on formation mechanism of ordered porous anodized metal oxides

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Rare Metals 2024年第10期43卷 5410-5418页

作者： xi-di sun xin Guo Jia-Han Zhang Jing Wu Yi Shi Hui-Yuan sun Cao-Feng Pan Li-Jia Pan Collaborative Innovation Center of Advanced Microstructures School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China College of Physics and Hebei Advanced Thin Film Laboratory Hebei Normal UniversityShijiazhuang 050024China Institute of Atomic Manufacturing Beihang UniversityBeijing 100191China

The preparation of ordered porous metal oxide films by anodic oxidation is an efficient and simple preparation ***,there has been no unified explanation about the formation mechanism of the porous structure for many *** this paper,the relationship between the crystal structure of metals and the morphology of ordered porous metal oxide films is *** influence of the crystal structures of different metals on the optimal morphology of porous films is discussed.

关键词： ordered mechanism metals

Correlation between anxiety, depression, and social stress in young patients with thoracolumbar spine fractures

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World Journal of Psychiatry 2025年第1期15卷 83-92页

作者： Bo Wang Da Shi Yin-di sun Bo Dong Joint Ward of Orthopedics Department of TCM Honghui HospitalXi'an Jiaotong UniversityXi’an 710054Shaanxi ProvinceChina Pain Ward of Orthopedics Department of TCM Honghui HospitalXi'an Jiaotong UniversityXi’an 710054Shaanxi ProvinceChina

BACKGROUND Traumatic injuries,such as falling,car accidents,and crushing mostly cause spinal fractures in young and middle-aged people,and>50%of them are thoracolumbar *** kind of fracture is easily combined with serious injuries to peripheral nerves and soft tissues,which causes paralysis of the lower limbs if there is no timely rehabilitation *** patients with thoracolumbar fractures find it difficult to recover after the operation,and they are prone to depression,low self-esteem,and other negative *** To investigate the association between anxiety,depression,and social stress in young patients with thoracolumbar spine fractures and the effect on rehabilitation *** This study retrospectively analyzed 100 patients admitted to the orthopedic department of Honghui Hospital,xi’an Jiaotong University who underwent thoracolumbar spine fracture surgery from January 2022 to June *** general data of the patients were assessed with the Hamilton anxiety scale(HAMA),Hamilton depression scale(HAMD),life events scale,and social support rating scale(SSRS)to identify the correlation between anxiety,depression scores,and social stress and social *** Japanese Orthopedic Association(JOA)was utilized to evaluate the rehabilitation outcomes of the patients and to analyze the effects of anxiety and depression scores on *** According to the scores of HAMD and HAMA in all patients,the prevalence of depression in patients was 39%(39/100),and the prevalence of anxiety was 49%(49/100).Patients were categorized into non-depression(n=61)and depression(n=39),non-anxiety(n=51),and anxiety(n=49)*** significant differences in gender,occupation,Pittsburgh Sleep Quality Index(PSQI)score,and monthly family income were observed between the non-depression and depression groups(Pdifference in occupation and PSQI score was found between the non-anxiety and anxiety *** depression(r=0

关键词： Patients with thoracolumbar fractures Anxiety Depression Social pressure Social support

Role of carbon in modifying solidification and microstructure of a Ni?based superalloy with high Al and Ti contents

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Journal of Iron and Steel Research International 2021年第1期28卷 98-110页

作者： Guang‑di Zhao xi‑min Zang Wen‑ru sun School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

The effect of carbon ranging from 0.014 to 0.071 wt.%on the solidification and microstructure of a Ni-based superalloy with high Al and Ti contents was *** results show that the increase in carbon addition significantly increases the size and volume fraction of MC carbides and promotes the change of their morphology from blocky to elongated ***,the carbon addition obviously decreases the size and volume fraction of eutectic(γ+γ′)and reducesηphase and borides *** change in carbide characteristics is mainly because of the increasing carbide-forming element and carbides precipitation temperature with the increase in carbon which favors the growth of them along the interdendritic liquid *** carbides are formed at an earlier solidification stage than the eutectic(γ+γ′).The increased carbide formation consumes more Ti,which delays and reduces the eutectic(γ+γ′)*** delay of eutectic(γ+γ′)precipitation leads to a deeper undercooling,which significantly decreases the critical Ti concentration for its ***,in turn,lowers Ti/Al ratio in residual liquids ahead of the eutectic(γ+γ′)and hence reducesηformation subsequently.B and Zr are slightly enriched in the carbides,which are considered during discussing how carbon influences the eutectic(γ+γ′)precipitation.

关键词： Carbon Ni-based superalloy Solidification Segregation Eutectic(γ+γ′) MC carbide

Credit-based scheme for security-aware and fairness-aware resource allocation in cloud computing

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Science China(Information Sciences) 2017年第5期60卷 96-112页

作者： di LU Jianfeng MA Cong sun xindi MA Ning xi School of Computer Science Xidian University

Cloud computing systems include different types of participants with varied requirements for resources and multiple tasks; these varying requirements must be considered in the design of fairness-aware resource allocation schemes for better resources sharing. However, some participants may be malicious with a goal to damage the resource allocation fairness and increase their own utility. Hence, the resource scheduling policy must guarantee allocation fairness among the participants; further, it must ensure that fairness is not affected by the malicious usage of resources, that could cause resource exhaustion and lead to denial of service. In order to address this challenge, we propose a credit-based mechanism for resource allocation that will avoid the malicious usage of resources and, simultaneously, guarantee allocation fairness. In our scheme, a credit factor is introduced for each participant in order to evaluate the history of resource utilization and determine future resource allocation. Our model encourages a participant to release the occupied resources in timely manner after the completion of a task and imposes a punishment for malicious occupation of resources. We prove the fairness of our model and provide linear and variable gradient approaches to determine the credit factor for different scenarios. We simulate our model and perform experiments on a real cloud computing platform. The results prove the rationality, effectiveness and correctness of our approaches.

关键词： credit resource allocation security fairness cloud computing

Microstructure and hot ductility behavior of Ni-based superalloy U720Li with boron addition

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Rare Metals 2021年第5期40卷 1145-1154页

作者： Guang-di Zhao Fang Liu xi-Min Zang Wen-Ru sun School of Material and Metallurgy University of Science and Technology LiaoningAnshan 114051China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

High-alloyed superalloy U720 Li is difficult to be processed through the conventional cast and wrought *** is an important strengthening element for superalloys,but the role of boron in the hot ductility of U720 Li alloy is not *** study is focused on the effect of boron addition,in the range ofdition significantly increases the content of eutectic(γ+γ’)and greatly affects the degree of continuity of the grain boundary eutectic(γ+γ’)*** addition dramatically worsens the 1100℃ tensile ductility of conventional cast U720 Li alloy and causes a change in tensile fracture mode from transgranular to *** eutectic(γ+γ’)represents the most effective site for crack *** deteriorates the hot ductility mainly by promoting the continuous precipitation of eutectic(γ+γ’)along the grain boundary.

关键词： Boron U720Li Eutectic(γ+γ’) Hot ductility Fracture mechanism

Observation of mechanical bound states in the continuum in an optomechanical microresonator

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Light(Science & Applications) 2022年第12期11卷 2931-2938页

作者： Yue Yu xiang xi xiankai sun Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina

Bound states in the continuum(BICs)are a type of waves that are perfectly confined in the continuous spectrum of radiating waves without interaction with ***,we fabricated,with CMOS-compatible processes on a silicon chip,a wheel-shaped optomechanical microresonator,in which we experimentally observed the BIC in the micromechanical *** BIC results from destructive interference between two dissipative mechanical modes of the microresonator under broken azimuthal *** BICs can be obtained from devices with large and robust supporting structures with variable sizes,which substantially reduces fabrication difficulty and allows for versatile application *** results open a new way of phonon trapping in micromechanical structures with dissipation channels,and produce long phonon lifetimes that are desired in many mechanical applications such as mechanical oscillators,sensors,and quantum information processors.

关键词： phonon continuum states

Non-affine parameter dependent LPV model and LMI based adaptive control for turbofan engines

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Chinese Journal of Aeronautics 2019年第3期32卷 585-594页

作者： Bei YANG xi WANG Penghui sun School of Energy and Power Engineering Beihang University School of Aircraft Engineering Nanchang Hangkong University

The precise control of turbofan engines thrust is an important guarantee for an aircraft to obtain good flight performance and a challenge due to complex nonlinear dynamics of engines and time-varying parameters. The main difficulties lie in the following two aspects. Firstly, it is hard to obtain an accurate kinetic model for the turbofan engine. Secondly, some model parameters often change in different flight conditions and states and even fluctuate sharply in some cases. These variable parameters bring huge challenge for the turbofan engine control. To solve the turbofan engine control problem, this paper presents a non-affine parameter-dependent Linear Parameter Varying(LPV) model-based adaptive control approach. In this approach, polynomial-based LPV modeling method is firstly employed to obtain the basis matrices, and then the Radial Basis Function Neural Networks(RBFNN) is introduced for the online estimation of the non-affine model parameters to improve the simulation performance. LPV model-based Linear Matrix Inequality(LMI) control method is applied to derive the control law. A robust control term is introduced to fix the estimation error of the nonlinear time-varying model parameters for better control performance. Finally, the Lyapunov stability analysis is performed to ensure the asymptotical convergence of the closed loop system. The simulation results show that the states of the engine can change smoothly and the thrust of the engine can accurately follow the desired trajectory, indicating that the proposed control approach is effective. The contribution of this work lies in the combination of linear system control and nonlinear system control methods to design an effective controller for the turbofan engine and to provide a new way for turbofan engine control research.

关键词： Adaptive control Linear matrix inequalities Linear parameter varying Neural networks Turbofan engines

Experimental constraints on trace element partitioning between coesite and hydrous silicate melt at 5 GPa and 1500-1750℃

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Science China Earth Sciences 2021年第7期64卷 1171-1183页

作者： Wei YAN xi LIU Saijun sun Weidong sun Dan WU Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education of ChinaBeijing 100871China School of Earth and Space Sciences Peking UniversityBeijing 100871China Center of Deep Sea Research Institute of OceanographyChinese Academy of SciencesQingdao 266071China Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

Trace element partitioning between coesite and hydrous silicate melt has been investigated at 5 GPa and 1500-1750℃.High-P experiments successfully produced large coesite crystals in equilibrium with large silicate melt pools(plus kyanite and corundum crystals in some cases).Scanning electron microscopy and micro-Raman spectroscopy were employed to characterize the phases and the ***-dispersive electron microprobe analyses were performed to quantify conventional major elements,and laser ablation-inductively coupled plasma-mass spectrometry analyses were successfully conducted to quantify trace ***,high-P partition coefficients were obtained for 33 *** general coesite is a very pure *** a few possible exceptions like Sc,Ti,and V,nearly all other trace elements are incompatible in ***,the partitioning behaviors of nearly all trace elements except some 4+cations cannot be readily described by the lattice strain model,presumably implying a minor role for the cation size in the trace-element *** our experimental results with the results in the literature,some T and P effects on the element partitioning behavior have been observed:T seemingly has different effects on different trace elements,but P might negatively correlate with the partition coefficients in all *** to its large modal fraction in some subducted materials such as the continental crustal material,coesite might play an important role in the distributions of some trace elements,Ti for example.

关键词： Partition coefficients High-P experiments LA-ICP-MS Coesite Hydrous silicate melt Temperature and pressure dependence