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Design and conductivity optimization of La0.3Sr0.7TiO3/La0.8Sr0.2MnO3 bi-layer structures as tubular segmented-in-series solid oxide fuel cell interconnect 认领 引用
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作者 Rui Shi Yan'an Li +5 位作者 Jiutao Gao Ziyang Chen Xin Zhang Shanlin Zhang Zaheer Ud Din Babar Chengxin Li 《Journal of Rare Earths》 SCIE EI CAS CSCD 2025年第9期1920-1928,共9页
This study focused on meeting the stringent stability requirements of tubular segmented-in-series solid oxide fuel cells(SOFCs) in reducing and oxidizing atmospheres.To address this challenge,a bi-layer perovskite cer... This study focused on meeting the stringent stability requirements of tubular segmented-in-series solid oxide fuel cells(SOFCs) in reducing and oxidizing atmospheres.To address this challenge,a bi-layer perovskite ceramic interconnect was designed by controlling the oxygen partial pressure,because of the strong correlation between the conductivity of strontium-doped lanthanum titanate(LST) and the oxygen partial pressure.The LST powder was prepared using solid-phase and sol-gel methods,and their influence on particle size and sintering behavior was compared.LST/lanthanum strontium manganite(LSM) bi-layer ceramic interconnects with varying thicknesses were fabricated through screen printing and co-sintering.The results demonstrate favorable interfacial bonding and excellent chemical compatibility between the ceramic layers.The conductivity of the bi-layer interconnect exhibits a temperature-dependent behavior,peaking at 550℃.Simulation calculations and research findings validate that the co nductivity of the bi-layer interconnect is determined by the thickness of the LSM layer and the oxygen partial pressure at the interconnect interface.Optimal conductivity is achieved with a bilayer interconnect consisting of approximately 15 μm of LST and 4 μm of LSM.This can be attributed to the efficient regulation of oxygen partial pressure at the interface,effectively mitigating LSM decomposition caused by low oxygen partial pressure and the subsequent reduction in conductivity.These results provide valuable fundamental data and methodology for the development of high-performance interconnects for tubular segmented-in-series SOFCs. 展开更多
关键词 Tubular SOFCs Interconnects Bi-layer La0.3Sr0.7TiO3/La0.8Sr0.2MnO3 Electrical conductivity Rareearths
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3D-printed,bi-layer,biomimetic artificial periosteum for boosting bone regeneration 认领 引用 被引量：6
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作者 Yage Sun Ziwei Gao +7 位作者 Xiaoping Zhang Ziyang Xu Yahan Zhang Binbin He Rong Yang Qian Zhang Qiang Yang Wenguang Liu 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2022年第3期540-555,共16页
Periosteum,a membrane covering the surface of the bone,plays an essential role in maintaining the function of bone tissue—and especially in providing nourishment and vascularization during the bone regeneration proce... Periosteum,a membrane covering the surface of the bone,plays an essential role in maintaining the function of bone tissue—and especially in providing nourishment and vascularization during the bone regeneration process.Currently,most artificial periostea have relatively weak mechanical strength and a rapid degradation rate,and they lack integrated angiogenesis and osteogenesis functions.In this study,a bi-layer,biomimetic,artificial periosteum composed of a methacrylated gelatin–nano-hydroxyapatite(GelMA-nHA)cambium layer and a poly(N-acryloyl 2-lycine)(PACG)-GelMA-Mg2+fibrous layer was fabricated via 3D printing.The GelMA-nHA layer is shown to undertake the function of improving osteogenic differentiation of rat bone marrow mesenchymal stem cells with the sustainable release of Ca2+ from nHA nanoparticles.The hydrogen-bonding-strengthened P(ACG-GelMA-L)-Mg2+hydrogel layer serves to protect the inner defect site and prolong degradation time(60 days)to match new bone regeneration.Furthermore,the released magnesium ion exhibits a prominent effect in regulating the polarization phenotype of macrophage cells into theM2 phenotype and thus promotes the angiogenesis of the human umbilical vein endothelial cells in vitro.This bi-layer artificial periosteum was implanted into a critical-sized cranial bone defect in rats,and the 12-week post-operative outcomes demonstrate optimal new bone regeneration. 展开更多
关键词 3D printing Bi-layer periosteum scaffold Immune regulation Bone regeneration
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High-Efficiency Wide-Band Cross-Polarization Conversion Using Bi-layered Metal Hole Pairs 认领 引用 被引量：1
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作者 Yong Zhang Xian-Ke Li Cheng-Ping Huang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2018年第10期40-43,共4页
We present a polarization converter composed of bi-layered metal films perforated with rectangle hole pairs in each film. The proposed converter can convert the polarization of an incident linearly-polarized electroma... We present a polarization converter composed of bi-layered metal films perforated with rectangle hole pairs in each film. The proposed converter can convert the polarization of an incident linearly-polarized electromagnetic wave to its orthogonal direction with high efficiency and large bandwidth in the infrared or microwave regions.To make sure of the mechanism of polarization conversion, the current and electric-field distributions at different resonant frequencies are analyzed. It is found that the cross-polarized transmission is due to the near-field coupling between hole pairs in neighboring metal films. Finally, a prototype of the proposed converter is fabricated and measured in the microwave region. Good agreement between the experimental and simulated results is obtained. 展开更多
关键词 High-Efficiency Wide-Band Cross-Polarization Conversion Using Bi-layered Metal Hole Pairs
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Fabrication of a Bi-layer Tubular Scaffold Consisted of a Dense Nanofibrous Inner Layer and a Porous Nanoyarn Outer Layer for Vascular Tissue Engineering 认领 引用
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作者 CHEN Jian-feng LIU Wei +4 位作者 WU Tong LI Da-wei ZHANG Jian-guang WANG Nan-ping MO Xiu-mei 《Journal of Donghua University(English Edition)》 EI CAS 2014年第5期718-722,共5页
Recent years, it has attracted more attentions to increase the porosity and pore size of nanofibrous scaffolds to provide the for the cells to grow into the small-diameter vascular grafts. In this study, a novel bi-la... Recent years, it has attracted more attentions to increase the porosity and pore size of nanofibrous scaffolds to provide the for the cells to grow into the small-diameter vascular grafts. In this study, a novel bi-layer tubular scaffold with an inner layer and an outer layer was fabricated. The inner layer was random collagen/poly （ L-lactide-co-caprolactone ） I P （ LLA- CL） ] nanofibrous mat fabricated by conventional electrospinning and the outer layer was aligned collagen/P （LLA-CL） nanoyarns prepared by a dynamic liquid dectrospinning method. Fourier transform infrared spectroscopy （FTIR） was used to characterize the chemical structure. Scanning electron microscopy （ SEM ） was employed to observe the morphology of the layers and the cross- sectioned bi-layer tubular scaffold. A liquid displacement method was employed to measure the porosities of the inner and outer layers. Stress-strain curves were obtained to evaluate the mechanical properties of the two different layers and the bi-layer membrane. The diameters of the nanofibers and the nanoyarns were （480 ± 197 ） nm and （ 19.66 ± 4.05 ） μm, respectively. The outer layer had a significantly higher porosity and a larger pore size than those of the inner layer. Furthermore, the bi-layer membrane showed a good mechanical property which was suitable as small-diameter vascular graft. The results indicated that the bi-layer tubular scaffold had a great potential application in small vascular tissue engineering. 展开更多
关键词 nanoyarn poly L-lactide-co-caprolactone P LLA-CL bi-layer tubular scaffold porous structure small vascular tissueengineering
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Development of controlled release bi-layered tablets containing oxycodone hydrochloride 认领 引用 被引量：1
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作者 Kyung Hun Kim Kyung Soo Lee +5 位作者 Il Woo Jung Jin Seob Oh Seo Hyun Lim Sung Hoon Lee Woo Heon Song Jun Sang Park 《Asian Journal of Pharmaceutical Sciences》 SCIE CAS 2016年第1期178-178,共1页
Oxycodone hydrochloride is a semi-synthetic opioid agonist that provides very effective relief for moderate to severe pain in cancer and post-operative patients. Controlled release oxycodone formulations have been stu... Oxycodone hydrochloride is a semi-synthetic opioid agonist that provides very effective relief for moderate to severe pain in cancer and post-operative patients. Controlled release oxycodone formulations have been studied to enhance the therapeutic effect by providing constant release over the whole dosing interval and improve patient’s convenience by reducing the frequency of administration as well. 展开更多
关键词 Oxycodone Control release Bi-layered tablet IVIVC
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An analytic model for transient heat conduction in bi-layered structures with flexible serpentine heaters 认领 引用 被引量：1
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作者 Zhao ZHAO Yuhang LI +2 位作者 Sujun DONG Yi CUI Zheng DAI 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2021年第9期1279-1296,共18页
Uniform heating of complex surfaces,especially non-developable surfaces,is a crucial problem that traditional rigid heaters cannot solve.Inspired by flexible electronic devices,a novel design for the stretchable heati... Uniform heating of complex surfaces,especially non-developable surfaces,is a crucial problem that traditional rigid heaters cannot solve.Inspired by flexible electronic devices,a novel design for the stretchable heating film is proposed with the flexible serpentine wire embedded in the soft polymer film,which can be attached to non-developable surfaces conformally.It provides a new way for the stretchable heaters to realize uniform heating of complex surfaces.However,the thermal field of flexible serpentine heaters(FSHs)depends on the configurations of the embedded serpentine heating wire,which requires accurate theoretical prediction of real-time temperature distribution.Therefore,the analytical model for the transient heat conduction in FSHs is solved by the separation of variables method and validated by the finite element analysis(FEA)in this paper.Based on this model,the effects of the geometric parameters,such as the radius and the length of the serpentine heaters,on the thermal uniformity are systematically investigated.This study can help to design and fabricate flexible heaters with uniform heating in the future. 展开更多
关键词 serpentine heater bi-layered structure transient heat conduction temperature distribution
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Developments of Cr-Si and Ni-Cr Single-Layer Thin-Film Resistors and a Bi-Layer Thin-Film Resistor with Adjustable Temperature Coefficient of Resistor 认领 引用
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作者 Huan-Yi Cheng Ying-Chung Chen +3 位作者 Chi-Lun Li Pei-Jou Li Mau-Phon Houng Cheng-Fu Yang 《Materials Sciences and Applications》 2016年第12期895-907,共13页
At first, Cr-Si (28 wt% Cr, 72 wt% Si) and Ni-Cr (80 wt% Ni, 20 wt% Cr) thin-film materials were deposited by using sputtering method at the same parameters, and their physical and electrical properties were investiga... At first, Cr-Si (28 wt% Cr, 72 wt% Si) and Ni-Cr (80 wt% Ni, 20 wt% Cr) thin-film materials were deposited by using sputtering method at the same parameters, and their physical and electrical properties were investigated. The resistances of Cr-Si and Ni-Cr thin-film resistors decreased with the increase of deposition time (thickness) and their resistivity had no apparent variations as the deposition time increased. The temperature coefficient of resistance (TCR) of single-layer Cr-Si thin-film resistors was negative and the TCR value of single-layer Ni-Cr thin-film resistors was positive. For that, we used Cr-Si thin films as upper (or lower) layer and Ni-Cr thin films as lower (upper) layer to investigate a bi-layer thin-film structure. The deposition time of Ni-Cr thin films was fixed at 10 min and the deposition time of Cr-Si thin films was changed from 10 min to 60 min. We had found that as Cr-Si thin films were used as upper or lower layers they had similar deposition rates. We had also found that the thickness and stack method of Cr-Si thin films had large effects on the resistance and TCR values of the bi-layer thin-film resistors. 展开更多
关键词 Cr-Si Ni-Cr Sputtering Method Sheet Resistance Bi-Layer Structure
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CeO2-supported bi-layer Pt clusters for anti-Markovnikov alkene hydrosilylation 认领 引用
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作者 Sunpei Hu Haofan Lei +7 位作者 Junlong Shi Yongjie Ye Fenglin Peng Wenlong Wu Jian Zhang Han Yan Chao Ma Jie Zeng 《Science China Chemistry》 SCIE EI CAS CSCD 2026年第2期946-952,共7页
Precisely identifying the atomic structure of reducible oxide-supported metal clusters remains challenging yet critical for understanding their catalytic behavior.Herein,we report the preparation of CeO2-supported ... Precisely identifying the atomic structure of reducible oxide-supported metal clusters remains challenging yet critical for understanding their catalytic behavior.Herein,we report the preparation of CeO2-supported bi-layer Pt clusters(Ptn/CeO2)via a deposition-reduction strategy,with Pt cluster sizes ranging from 0.8 to 1.2 nm(9–30 atoms).Through combined aberration-corrected high-angle annular dark field scanning transmission electron microscope(HAADF-STEM)imaging,quantitative STEM simulations,and X-ray fine structure(XAFS)analysis,we reveal the bi-layer configuration featuring coordinatively unsaturated Pt0 sites on the top layer while maintaining Pt-CeO2interfacial bonding at the bottom.When applied to anti-Markovnikov alkene hydrosilylation,Ptn/CeO2achieves 99.9%silane conversion with a mass-specific activity 2.0×and 8.8×higher than single-atom site(Pt1/CeO2)and nanoparticle(PtNP/CeO2)counterparts,respectively.The bi-layer structure endows exceptional cycling stability and anti-leaching properties.This work establishes a multi-scale characterization paradigm to resolve atomic-precision structures of supported clusters,opening avenues for designing robust catalysts with tailored metal-oxide interfaces. 展开更多
关键词 Pt/CeO2catalyst bi-layer Pt clusters metal-support interaction size effect alkene hydrosilylation
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Characterization of Micro and Nano-Scaled Co/Ni Bi-Layered Films Electrodeposited Under Influence of Magnetic Field:Effects on Structure and Morphology 认领 引用
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作者 LEVESQUE Alexandra LI Donggang +2 位作者 FRANCZAK Agneszka WANG Qiang CHOPART Jean-Paul 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2012年第S2期1145-1148,共4页
In this study,the possibility of obtaining micro and nano-scaled Co/Ni bi-layered films by use of the electrochemical method was investigated.The electrodeposition process was performed with presence and absence of a ... In this study,the possibility of obtaining micro and nano-scaled Co/Ni bi-layered films by use of the electrochemical method was investigated.The electrodeposition process was performed with presence and absence of a uniform external magnetic field up to 1T to examine its influence on structure and morphology of the obtained thin films. Afterwards,each sample was annealed under high magnetic field with strength up to 12 T at 623 K,what allowed compare and determine the changes in morphology and structure,before and after heat treatment.The Co/Ni bi-layered thin films were deposited onto an indium-doped tin oxide(ITO)-coated conducting glass substrate from sulfate baths with boric acid as an additive.The results show drastic changes in the morphology between macro and nano-scaled films which were strongly affected by an introduction of the magnetic field to the electrodeposition process.The annealing process allowed to determine the nucleus transition and showed that under the high temperature treatment it is possible to control the growth mode as well as the phase composition changes. 展开更多
关键词 Co/Ni bi-layered films electrodeposition onto ITO micro and nano-structure magnetic field annealing process
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A bi-layer coordinated power regulation strategy considering system dynamics and economics for isolated hybrid AC/DC multi-energy microgrid 认领 引用 被引量：1
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作者 Jing ZHANG Yong LI +7 位作者 Jinjie LIN Sijia HU Yijia CAO Li HE Xusheng YANG Yong XU Lin ZENG Linjin XIE 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2025年第1期374-390,共17页
The isolated hybrid AC/DC multi-energy microgrid(IH-MEMG)offers an effective solution for meeting the electrical,heating,and cooling energy demands of remote and off-grid areas.For an IH-MEMG,system transient dynamics... The isolated hybrid AC/DC multi-energy microgrid(IH-MEMG)offers an effective solution for meeting the electrical,heating,and cooling energy demands of remote and off-grid areas.For an IH-MEMG,system transient dynamics(i.e.,frequency or voltage of the electricity network)and economics are critical aspects that pose the greatest concern to operators.However,these aspects are generally investigated separately owing to their different time scales.To integrate these aspects from the scope of real-time control,this study proposes a bi-layer coordinated power regulation strategy considering system dynamics and economics for the IH-MEMG.First,coupling relationships among multiple sub-networks are analyzed,and a frequency-voltage coupling model between the AC and DC sides is established.Then,a bi-layer coordinated power regulation strategy is developed for the IH-MEMG with output characteristics of different components involved:the primary layer includes a multi-entity power support mechanism used to improve the dynamics of the electricity network,wherein a cooperation principle of the combined cooling,heating,and power(CCHP)unit and energy storage unit(ESU)is designed in detailed;meanwhile,the secondary layer includes a real-time economics-oriented optimization framework used to adjust the power references of multiple units generated from the primary layer for cost efficiency improvement(notably,the primary layer can work independently).Finally,the effectiveness of the proposed strategy is verified through comprehensive simulations under varying operation scenarios. 展开更多
关键词 isolated hybrid AC/DC multi-energy microgrid bi-layer coordinated power regulation dynamics and economics combined cooling heating and power unit energy storage unit
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Enhancing ferroelectric properties of Hf0.5Zr0.5O2 thin films using the HfN/TiN and W/TiN bi-layer bottom electrodes 认领 引用 被引量：1
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作者 Han Sol Park Joong Chan Shin +7 位作者 Kyung Do Kim Seong Jae Shin Jae Hee Song Seung Kyu Ryoo In Soo Lee Suk Hyun Lee Hyunwoo Nam Cheol Seong Hwang 《Journal of Materiomics》 SCIE CSCD 2025年第6期252-262,共11页
This study clarifies the influence of single-layer(TiN,HfN,W)and bi-layer(HfN/TiN,W/TiN)bottom electrodes(BEs)on the ferroelectric performance and reliability of the 10-nm-thick Hf0.5Zr0.5O2(HZO)thin films.A ... This study clarifies the influence of single-layer(TiN,HfN,W)and bi-layer(HfN/TiN,W/TiN)bottom electrodes(BEs)on the ferroelectric performance and reliability of the 10-nm-thick Hf0.5Zr0.5O2(HZO)thin films.A smaller thermal expansion coefficient in HfN or W imposes higher in-plane tensile stress on the HZO thin films,facilitating the polar orthorhombic(o-)phase fraction and enhancing remanent polarization(Pr).However,thicker interfacial layers formed when HfN or W single-layer BE and HZO contacted directly,leading to excessive leakage current and degraded ferroelectric performance.These excessive interfacial layers were effectively suppressed by inserting a thin(5 nm-20 nm)TiN layer on the HfN or W BEs.As a result,the HZO thin films on the HfN/TiN and W/TiN bi-layer BEs decrease the HZO grain size,facilitating the o-phase formation(increasing Pr)and lowering the film's coercive field.However,the higher surface roughness of the W/TiN bi-layer BEs induced excessive leakage current and reliability degradation.In contrast,the HfN BEs with a 10-or 20-nm-thick upper TiN layer lower the surface roughness of the BEs,thereby eliminating the adverse effects.As a result,the HfN 40 nm/TiN 10 nm/HZO/TiN stack exhibited enhanced ferroelectric performance up to 109switching cycles with a lower cycling field of 2.7 MV/cm than the TiN 50 nm/HZO/TiN stack with a cycling field of 3.7 MV/cm. 展开更多
关键词 Ferroelectric Hf0.5Zr0.5O2 Coefficient of thermal expansion Tensile stress Bi-layer bottom electrode
Deep Reinforcement Learning Based Bi-layer Optimal Scheduling for Microgrids Considering Flexible Load Control 认领 引用 被引量：9
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作者 Zitong Zhang Jing Shi +3 位作者 Wangwang Yang Zhaofang Song Zexu Chen Dengquan Lin 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2023年第3期949-962,共14页
In this paper,the bi-layer scheduling method for microgrids,based on deep reinforcement learning,is proposed to achieve economic and environmentally friendly operations.First,considering the uncertainty of renewable e... In this paper,the bi-layer scheduling method for microgrids,based on deep reinforcement learning,is proposed to achieve economic and environmentally friendly operations.First,considering the uncertainty of renewable energy,the framework of day-ahead and intra-day scheduling is established,and the implementation scheme for both price-based and incentive-based demand response(DR)for the flexible load is determined.Then,comprehensively considering the operating characteristics of the microgrid in the day-ahead and intra-day time scales,a bi-layer scheduling model of the microgrid is established.In terms of algorithms,since day-ahead scheduling has no strict requirement for dispatching time,the particle swarm optimization(PSO)algorithm is used to optimize the time-of-use electricity price and distributed power output for the next day.Considering the environmental fluctuations and requirements for rapidity of intra-day online scheduling,the deep reinforcement learning(DRL)algorithm is adopted for optimization.Finally,based on the data from the actual microgrid,the rationality and effectiveness of the proposed scheduling method is verified.The results show that the proposed bi-layer scheduling based on the PSO and DRL algorithms achieves the optimization of scheduling cost and calculation speed,and is suitable for microgrid online scheduling. 展开更多
关键词 Bi-layer optimal scheduling demand response deep reinforcement learning microgrid scheduling
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Analysis of the in vitro degradation and the in vivo tissue response to bi-layered 3D-printed scaffolds combining PLA and biphasic PLA/bioglass components--Guidance of the inflammatory response as basis for osteochondral regeneration 认领 引用 被引量：5
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作者 Mike Barbeck Tiziano Serra +7 位作者 Patrick Booms Sanja Stojanovic Stevo Najman Elisabeth Engel Robert Sader Charles James Kirkpatrick Melba Navarro Shahram Ghanaati 《Bioactive Materials》 SCIE 2017年第4期208-223,共16页
The aim of the present study was the in vitro and in vivo analysis of a bi-layered 3D-printed scaffold combining a PLA layer and a biphasic PLA/bioglass G5 layer for regeneration of osteochondral defects in vivo Focus... The aim of the present study was the in vitro and in vivo analysis of a bi-layered 3D-printed scaffold combining a PLA layer and a biphasic PLA/bioglass G5 layer for regeneration of osteochondral defects in vivo Focus of the in vitro analysis was on the(molecular)weight loss and the morphological and mechanical variations after immersion in SBF.The in vivo study focused on analysis of the tissue reactions and differences in the implant bed vascularization using an established subcutaneous implantation model in CD-1 mice and established histological and histomorphometrical methods.Both scaffold parts kept their structural integrity,while changes in morphology were observed,especially for the PLA/G5 scaffold.Mechanical properties decreased with progressive degradation,while the PLA/G5 scaffolds presented higher compressive modulus than PLA scaffolds.The tissue reaction to PLA included low numbers of BMGCs and minimal vascularization of its implant beds,while the addition of G5 lead to higher numbers of BMGCs and a higher implant bed vascularization.Analysis revealed that the use of a bi-layered scaffold shows the ability to observe distinct in vivo response despite the physical proximity of PLA and PLA/G5 layers.Altogether,the results showed that the addition of G5 enables to reduce scaffold weight loss and to increase mechanical strength.Furthermore,the addition of G5 lead to a higher vascularization of the implant bed required as basis for bone tissue regeneration mediated by higher numbers of BMGCs,while within the PLA parts a significantly lower vascularization was found optimally for chondral regeneration.Thus,this data show that the analyzed bi-layered scaffold may serve as an ideal basis for the regeneration of osteochondral tissue defects.Additionally,the results show that it might be able to reduce the number of experimental animals required as it may be possible to analyze the tissue response to more than one implant in one experimental animal. 展开更多
关键词 Bioactive glass Polylactic acid(PLA) Bi-layer scaffold Multinucleated giant cells Bone substitute Vascularization Calcium phosphate glass
A biomimetic bi-layered tissue engineering scaffolds for osteochondral defects repair 认领 引用 被引量：9
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作者 LIU KaiQiang LIU YanNan +2 位作者 DUAN ZhiGuang MA XiaoXuan FAN DaiDi 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2021年第4期793-805,共13页
Osteochondral defects are most commonly characterized by damages to both cartilage and underlying subchondral bone tissues,thus developing bi-layered scaffold that can concurrently regenerate these two specific lineag... Osteochondral defects are most commonly characterized by damages to both cartilage and underlying subchondral bone tissues,thus developing bi-layered scaffold that can concurrently regenerate these two specific lineages becomes challenge.In this study,the highly biomimetic bi-layered scaffolds were successfully prepared using human-like-collagen(HLC),hyaluronan(HA)and nano hydroxyapatite(HAP)particles,combined with"liquid phase synthesis"technology,freeze-drying and chemical crosslinking techniques,which was simulated the composition of natural extracellular matrix to repair osteochondral defects.This novel bilayer osteochondral graft had a seamlessly integrated layer structure,suitable pore size,high levels of porosity,and excellent mechanical properties.In vitro cell experiments of the bilayer scaffold indicated that the scaffold could promote the proliferation and adhesion of human bone marrow mesenchymal stem cells.In vivo osteochondral defects and micro-CT experiment revealed that bilayer scaffolds showed complete closure of the defect.Histology confirmed collagen and glycosaminoglycans were deposited in the new matrix of hyaline cartilage and bone in the bilayer scaffold group.Therefore,the developed bionic bilayer scaffold enhanced the regeneration of hyaline cartilage through subchondral bone formation and lateral host-tissue integration.In conclusion,this bilayer scaffold based on HLC could be used as the desired strategy for osteochondral defects regeneration. 展开更多
关键词 human-like collagen bi-layered scaffold osteochondral repair
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Optical beam splitting and asymmetric transmission in bi-layer metagratings 认领 引用
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作者 Qiangshi Shi Xia Jin +5 位作者 Yangyang Fu Qiannan Wu Cheng Huang Baoyin Sun Lei Gao Yadong Xu 《Chinese Optics Letters》 SCIE EI CAS CSCD 2021年第4期77-81,共5页
In this work, inspired by advances in twisted two-dimensional materials, we design and study a new type of optical bi-layer metasurface system, which is based on subwavelength metal slit arrays with phase-gradient mod... In this work, inspired by advances in twisted two-dimensional materials, we design and study a new type of optical bi-layer metasurface system, which is based on subwavelength metal slit arrays with phase-gradient modulation, referred to as metagratings(MGs). It is shown that due to the found reversed diffraction law, the interlayer interaction that can be simply adjusted by the gap size can produce a transition from optical beam splitting to high-efficiency asymmetric transmission of incident light from two opposite directions. Our results provide new physics and some advantages for designing subwavelength optical devices to realize efficient wavefront manipulation and one-way propagation. 展开更多
关键词 asymmetric transmission high efficiency bi-layer metagratings abrupt phase control
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Quantum percolation tunneling current 1/f^γ noise model for high-κ gate stacks Bi-layer breakdown 认领 引用
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作者 LIU YuAn ZHANG YiQi LI Cong 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第9期1637-1643,共7页
Based on the elastic trap-assisted tunneling mechanism in high-κgate stacks,a quantum percolation tunneling current 1/fγ noise model is proposed by incorporating quantum tunneling theory into the quantum percolation... Based on the elastic trap-assisted tunneling mechanism in high-κgate stacks,a quantum percolation tunneling current 1/fγ noise model is proposed by incorporating quantum tunneling theory into the quantum percolation model.We conclude that the noise amplitude of the PSD(Power Spectral Density)for three stages,namely the fresh device,one-layer BD(breakdown),and two-layer BD,increases from 10-22→10-14→10-8 A2/Hz.Meanwhile,the noise exponent γ for the three stages,has the 1/f2type(γ→2),1/fγ type(γ→1~2),and 1/f type(γ→1),respectively.The simulation results are in good agreement with the experimental results.This model reasonably interprets the correlation between the bi-layer breakdown and the tunneling 1/fγ noise amplitude dependence and 1/fγ noise exponent dependence.These results provide a theoretical basis for the high-κ gate stacks bi-layer breakdown noise characterization methods. 展开更多
关键词 1/f^γ noise quantum percolation tunneling MOSFETs high-κ gate stacks Bi-layer breakdown
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现货市场下需求响应及TCSC协同优化策略 认领 引用
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作者 张涛 张时超 +4 位作者 刘文丽 杨晓雷 徐艳春 王金 张磊 《电力自动化设备》 EI CSCD 北大核心 2026年第5期1-8,共8页
为应对以价格为信号执行电能调度所产生的输电阻塞现象,降低因阻塞而升高的发电成本和用电成本,提出一种需求响应和晶闸管控制串联电容器(TCSC)的协同优化策略。构建考虑负荷服务实体与系统运营商利益需求的双层非线性模型,上层以降低... 为应对以价格为信号执行电能调度所产生的输电阻塞现象,降低因阻塞而升高的发电成本和用电成本,提出一种需求响应和晶闸管控制串联电容器(TCSC)的协同优化策略。构建考虑负荷服务实体与系统运营商利益需求的双层非线性模型,上层以降低用电成本为目的,确定需求响应方案,下层确定机组出力、TCSC工作参数以及各节点边际电价;提出比例积分微分搜索算法(PSA)结合卡罗需‐库恩‐塔克(KKT)条件的PSA‐KKT求解方法,通过该方法降低模型非线性度,通过大M法将问题模型转化为混合整数线性模型,并采用CPLEX进行求解。IEEE 24节点系统的仿真结果表明,该策略可有效缓解输电阻塞并降低用电和发电成本,PSA‐KKT方法比传统方法具有更快的收敛速度和更精确的计算结果。 展开更多
关键词 输电阻塞 双层非线性模型 需求响应 晶闸管控制串联电容器 协同优化策略 PSA-KKT
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基于相似日和双层校正LSTM的光伏功率短期预测方法 认领 引用 被引量：1
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作者 石宇龙 彭乔 +3 位作者 刘天琪 陈刚 曾雪洋 李燕 《电力工程技术》 CSCD 北大核心 2026年第3期85-94,共10页
光伏功率的准确预测对于电力系统的调度、决策至关重要。为提高光伏功率预测精度,文中基于数据驱动原理,提出基于相似日和双层校正长短时记忆(long short-term memory,LSTM)的光伏功率短期预测方法。首先,对光伏功率和相关气象数据进行... 光伏功率的准确预测对于电力系统的调度、决策至关重要。为提高光伏功率预测精度,文中基于数据驱动原理,提出基于相似日和双层校正长短时记忆(long short-term memory,LSTM)的光伏功率短期预测方法。首先,对光伏功率和相关气象数据进行归一化处理,并通过皮尔逊系数确定影响光伏功率的关键因素,降低训练数据维度。然后,利用弗雷歇距离算法匹配待预测日的相似日,提升训练数据质量。最后,根据数值天气预报,基于特征学习方法在基准层LSTM中得到光伏功率一次预测值,并基于时间序列方法在校正层LSTM中得到光伏功率误差预测值,对一次预测值进行校正,得到最终预测值。以实地采集的真实数据为例,选取晴天、多云、雨天等不同天气下的参考日作为待预测对象进行算例分析。结果表明,使用文中所提模型与方法在不同条件下均能有效预测未来24h的短期光伏功率,相比已有方法能大幅提升预测精度。 展开更多
关键词 光伏系统 短期预测 相似日 长短时记忆(LSTM)网络 双层校正模型 弗雷歇距离算法
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Sn-Bi基焊料界面可靠性关键问题与改性策略研究进展 认领 引用
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作者 赏敏 马海涛 +2 位作者 马浩然 王加俊 王云鹏 《表面技术》 EI CAS CSCD 北大核心 2026年第3期219-243,共25页
系统综述了旨在提升Sn-Bi焊点界面可靠性的多层次改性策略。首先,评述了通过焊料合金化调控其本征性能的方法,系统分析了添加Ag、Cu、Ni、In、Sb、Zn、Co等元素对焊料微观结构、力学性能及界面反应动力学的影响。其次,探讨了以石墨烯为... 系统综述了旨在提升Sn-Bi焊点界面可靠性的多层次改性策略。首先,评述了通过焊料合金化调控其本征性能的方法,系统分析了添加Ag、Cu、Ni、In、Sb、Zn、Co等元素对焊料微观结构、力学性能及界面反应动力学的影响。其次,探讨了以石墨烯为代表的纳米颗粒强化机制,阐明其在细化晶粒和抑制IMC生长方面的作用。随后,重点阐述了以基板改性为核心的界面工程策略,深入剖析了Ni基金属镀层和Ni-P、Ni-W-P等先进复合镀层作为扩散阻挡层的核心机理,即通过改变界面反应热力学路径来抑制原子互扩散。同时,也关注了复合改性方法,如焊料合金化与基板表面处理,如ENEPIG的协同作用。最后,对未来研究方向进行了展望,指出开发高熵/非晶合金等新型阻挡层,并结合计算材料学与先进原位表征技术,将是实现下一代高可靠性Sn-Bi焊点界面“按需设计”的关键。 展开更多
关键词 Sn-Bi焊料 界面可靠性 金属间化合物 Bi相偏析 合金化 扩散阻挡层 纳米增强
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柿叶总黄酮双层渗透泵控释片处方的优化及体外释药的研究 认领 引用
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作者 王彦辰 魏龙 +2 位作者 李相阳 易勤 潘青 《西北药学杂志》 CAS 2026年第4期84-92,共9页
目的制备柿叶总黄酮双层渗透泵控释片,采用单因素考察结合正交实验设计,优化其处方工艺。方法建立柿叶总黄酮体外释放度测定方法,以累积释放度为评价指标,考察片芯和包衣膜主要处方组分对药物释放行为的影响;以f2相似因子对各因素水平... 目的制备柿叶总黄酮双层渗透泵控释片,采用单因素考察结合正交实验设计,优化其处方工艺。方法建立柿叶总黄酮体外释放度测定方法,以累积释放度为评价指标,考察片芯和包衣膜主要处方组分对药物释放行为的影响;以f2相似因子对各因素水平下的释放曲线进行评价,采用正交实验设计对片芯主要影响因素进行优化,并对优选处方进行验证。结果优选处方为片芯采用处方F16;包衣液由1.5 g·L−1聚乙二醇(polyethylene glycol,PEG)-4000和30 g·L−1醋酸纤维素组成;包衣增质量为11%;释药孔径为0.6 mm。优选处方2 h内无突释效应;12 h内累积释放率达85%以上,药物体外释放呈零级释药特征。结论经正交实验优化所得的柿叶总黄酮双层渗透泵控释片处方工艺的重复性良好,体外释药性能符合预期设计目标。 展开更多
关键词 柿叶总黄酮 双层渗透泵控释片 正交实验 处方优化 体外释药
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