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Natural sources,refined extraction,biosynthesis,metabolism,and bioactivities of dietary polymethoxyflavones(PMFs) 被引量:2
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作者 Renyou Gan Yi liu +6 位作者 hang li Yu Xia Huan Guo Fang Geng Qiguo Zhuang Huabin li Dingtao Wu 《Food Science and Human Wellness》 SCIE CSCD 2024年第1期27-49,共23页
Polymethoxyflavones(PMFs)are a type of uncommon dietary flavonoids,characterized by more than one methoxy group,which exist in limited plant species,like Citrus species and Kaempferia parviflora.In addition,different ... Polymethoxyflavones(PMFs)are a type of uncommon dietary flavonoids,characterized by more than one methoxy group,which exist in limited plant species,like Citrus species and Kaempferia parviflora.In addition,different PMFs,such as nobiletin,sinensetin,tangeretin,and casticin,have been isolated from these natural sources.PMFs have received increasing attention due to their multiple bioactivities,such as antioxidant,anti-inflammatory,anti-cancer,metabolic regulatory,immunoregulatory,neuroprotective,and skin protective effects.These bioactivities of PMFs should be associated with the regulation of critical molecular targets and the interaction with gut microbiota.In order to provide a comprehensive and updated review of PMFs,their natural sources,refined extraction,biosynthesis,metabolism,and bioactivities are summarised and discussed,with the emphasis on the molecular mechanisms of PMFs on regulating different chronic diseases.Overall,PMFs may be promising flavonoids to the forefront of nutraceuticals for the prevention and/or treatment of certain human chronic diseases. 展开更多
关键词 NOBILETIN O-METHYLTRANSFERASES Gut microbiota BIOACTIVITIES Molecular mechanism
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Analysis of the joint detection capability of the SMILE satellite and EISCAT-3D radar 被引量:2
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作者 JiaoJiao Zhang TianRan Sun +7 位作者 XiZheng Yu Dalin li hang li JiaQi Guo ZongHua Ding Tao Chen Jian Wu Chi Wang 《Earth and Planetary Physics》 EI CSCD 2024年第1期299-306,共8页
The Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)satellite is a small magnetosphere–ionosphere link explorer developed cooperatively between China and Europe.It pioneers the use of X-ray imaging technology... The Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)satellite is a small magnetosphere–ionosphere link explorer developed cooperatively between China and Europe.It pioneers the use of X-ray imaging technology to perform large-scale imaging of the Earth’s magnetosheath and polar cusp regions.It uses a high-precision ultraviolet imager to image the overall configuration of the aurora and monitor changes in the source of solar wind in real time,using in situ detection instruments to improve human understanding of the relationship between solar activity and changes in the Earth’s magnetic field.The SMILE satellite is scheduled to launch in 2025.The European Incoherent Scatter Sciences Association(EISCAT)-3D radar is a new generation of European incoherent scatter radar constructed by EISCAT and is the most advanced ground-based ionospheric experimental device in the high-latitude polar region.It has multibeam and multidirectional quasi-real-time three-dimensional(3D)imaging capabilities,continuous monitoring and operation capabilities,and multiple-baseline interferometry capabilities.Joint detection by the SMILE satellite and the EISCAT-3D radar is of great significance for revealing the coupling process of the solar wind–magnetosphere–ionosphere.Therefore,we performed an analysis of the joint detection capability of the SMILE satellite and EISCAT-3D,analyzed the period during which the two can perform joint detection,and defined the key scientific problems that can be solved by joint detection.In addition,we developed Web-based software to search for and visualize the joint detection period of the SMILE satellite and EISCAT-3D radar,which lays the foundation for subsequent joint detection experiments and scientific research. 展开更多
关键词 Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)satellite European Incoherent Scatter Sciences Association(EISCAT)-3D radar joint detection
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A novel nano-grade organosilicon polymer:Improving airtightness of compressed air energy storage in hard rock formations
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作者 Zhuyan Zheng Guibin Wang +7 位作者 Chunhe Yang Hongling Ma liming Yin Youqiang liao Kai Zhao Zhen Zeng hang li Yue Han 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第3期305-321,共17页
Enhancing cavern sealing is crucial for improving the efficiency of compressed air energy storage(CAES)in hard rock formations.This study introduced a novel approach using a nano-grade organosilicon polymer(NOSP)as a ... Enhancing cavern sealing is crucial for improving the efficiency of compressed air energy storage(CAES)in hard rock formations.This study introduced a novel approach using a nano-grade organosilicon polymer(NOSP)as a sealant,coupled with an air seepage evaluation model that incorporates Knudsen diffusion.Moreover,the initial coating application methods were outlined,and the advantages of using NOSP compared to other sealing materials,particularly regarding cost and construction techniques,were also examined and discussed.Experimental results indicated a significant reduction in permeability of rock specimens coated with a 7–10μm thick NOSP layer.Specifically,under a 0.5 MPa pulse pressure,the permeability decreased to less than 1 n D,and under a 4 MPa pulse pressure,it ranged between4.5×10^(-6)–5.5×10^(-6)m D,marking a 75%–80%decrease in granite permeability.The sealing efficacy of NOSP surpasses concrete and is comparable to rubber materials.The optimal viscosity for application lies between 95 and 105 KU,and the coating thickness should ideally range from 7 to 10μm,applied to substrates with less than 3%porosity.This study provides new insights into air transport and sealing mechanisms at the pore level,proposing NOSP as a cost-effective and simplified solution for CAES applications. 展开更多
关键词 Compressed air energy storage LINING Permeability Transient pulse method Hard rock cavern Nano-grade organosilicon polymer coating
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Small cell lung carcinoma with KIF5B-RET fusion partially responded to the 4^(th)-line therapy with anlotinib:A case report
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作者 Rui Zhang Yu-Ting He +2 位作者 Yi-Sha liu hang li Feng Zhao 《World Journal of Clinical Cases》 SCIE 2024年第23期5410-5415,共6页
BACKGROUND Small cell lung cancer(SCLC)exhibits a pronounced tendency for metastasis and relapse,and the acquisition of resistance to chemotherapy and radiotherapy,leading to complexity in treatment outcomes.It is cru... BACKGROUND Small cell lung cancer(SCLC)exhibits a pronounced tendency for metastasis and relapse,and the acquisition of resistance to chemotherapy and radiotherapy,leading to complexity in treatment outcomes.It is crucial to tackle these challenges by advancing targeted therapeutic approaches in ongoing research endeavors.Variant RET fusions have been reported in several solid tumors,but are rarely reported in SCLC.CASE SUMMARY We present the first case of a KIF5B-RET fusion in a 65-year-old male patient with SCLC.To date,the patient has received the 4th line chemotherapy with anlotinib for one year and has shown a sustained favorable partial response.According to the results of next generation sequencing,this SCLC patient harbors the KIF5BRET fusion,suggesting that RET fusion could serve as a promising molecular target for SCLC treatment.Next-generation sequencing(NGS)plays a critical rolein comprehensively assessing the genotype and phenotype of cancer.CONCLUSION NGS can provide SCLC patients with personalized and targeted therapy options,thereby improving their likelihood of survival. 展开更多
关键词 KIF5B-RET fusion Small cell lung cancer Anlotinib Partial response Next-generation sequencing Case report
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Hypoxia and inflammatory factor preconditioning enhances the immunosuppressive properties of human umbilical cord mesenchymal stem cells 被引量:4
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作者 hang li Xiao-Qing Ji +1 位作者 Shu-Ming Zhang Ri-Hui Bi 《World Journal of Stem Cells》 SCIE 2023年第11期999-1016,共18页
BACKGROUND Mesenchymal stem cells(MSCs)have great potential for the treatment of various immune diseases due to their unique immunomodulatory properties.However,MSCs exposed to the harsh inflammatory environment of da... BACKGROUND Mesenchymal stem cells(MSCs)have great potential for the treatment of various immune diseases due to their unique immunomodulatory properties.However,MSCs exposed to the harsh inflammatory environment of damaged tissue after intravenous transplantation cannot exert their biological effects,and therefore,their therapeutic efficacy is reduced.In this challenging context,an in vitro preconditioning method is necessary for the development of MSC-based therapies with increased immunomodulatory capacity and transplantation efficacy.AIM To determine whether hypoxia and inflammatory factor preconditioning increases the immunosuppressive properties of MSCs without affecting their biological characteristics.METHODS Umbilical cord MSCs(UC-MSCs)were pretreated with hypoxia(2%O_(2))exposure and inflammatory factors(interleukin-1β,tumor necrosis factor-α,interferon-γ)for 24 h.Flow cytometry,polymerase chain reaction,enzyme-linked immunosorbent assay and other experimental methods were used to evaluate the biological characteristics of pretreated UC-MSCs and to determine whether pretreatment affected the immunosuppressive ability of UC-MSCs in coculture with immune cells.RESULTS Pretreatment with hypoxia and inflammatory factors caused UC-MSCs to be elongated but did not affect their viability,proliferation or size.In addition,pretreatment significantly decreased the expression of coagulationrelated tissue factors but did not affect the expression of other surface markers.Similarly,mitochondrial function and integrity were retained.Although pretreatment promoted UC-MSC apoptosis and senescence,it increased the expression of genes and proteins related to immune regulation.Pretreatment increased peripheral blood mononuclear cell and natural killer(NK)cell proliferation rates and inhibited NK cell-induced toxicity to varying degrees.CONCLUSION In summary,hypoxia and inflammatory factor preconditioning led to higher immunosuppressive effects of MSCs without damaging their biological characteristics. 展开更多
关键词 Mesenchymal stem cells Umbilical cord PRECONDITIONING Hypoxia Inflammatory factors Immune regulation
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Parametric study on the ballistic performance of seamed woven fabrics 被引量:1
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作者 hang li Rui Zhang +2 位作者 Shengnan Min Yi Zhou Jiuxiao Sun 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第6期173-189,共17页
The ballistic perforation response of composite fabrics made by combining plain weaves with seaming technology is reported and compared with conventional unseamed plain fabrics.The effect of the seaming technique on t... The ballistic perforation response of composite fabrics made by combining plain weaves with seaming technology is reported and compared with conventional unseamed plain fabrics.The effect of the seaming technique on the ballistic resistance of aramid plain fabrics is investigated by varying the seaming process.The ballistic experiment uses 8 mm diameter spherical projectiles to impact different fabric sample targets with velocities of 230 m/s and 400 m/s.The ballistic performance of seamed and unseamed fabrics is characterized by the specific energy absorption(SEA)values of the fabrics.The results show that the seamed fabric has a better energy absorption capacity than the unseamed fabric,e.g.,the SEA of sample 5(seaming lines on every four yarns in a single-ply fabric system)is 135%of sample 1(plain weave without thread seaming).In the single-layer system,the effect of the seaming technique on the energy absorption of the fabric in significant when considering seaming density,seaming orientation,seaming distance,and seaming material on the plain fabric;In addition,it is found that in multi-layer systems,seamed panels(e.g.,sample 7)exhibit better ballistic performance than multi-layer fabrics(e.g.,sample 2),and the specific energy absorption of sample 7 is approximately 156%and 200%of sample 6 and sample 2,respectively.Meanwhile,the energy absorption of the fabric decreases with the increase of impact velocity,which is related to the energy absorption mechanism of the soft fabric system at high impact velocities.The yarn pull-out tests shows that the constraint provided by the seaming thread increases the friction between the fabric-forming yarns.However,when the constraint exceeds a certain level,it is detrimental to the energy absorption of the fabric,which may be due to the overconstraint of yarn mobility. 展开更多
关键词 FABRIC Ballistic performance Seaming technology Energy absorption
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Channel Capacity and Power Allocation of MIMO Visible Light Communication System 被引量:1
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作者 Shuai Ma Ruixin Yang +5 位作者 Guanjie Zhang hang li Wen Cao linqiong Jia Yanyu Zhang Shiyin li 《China Communications》 SCIE CSCD 2023年第2期122-138,共17页
In this paper,the channel capacity of the multiple-input multiple-output(MIMO)visible light communication(VLC)system is investigated under the peak,average optical and electrical power constraints.Finding the channel ... In this paper,the channel capacity of the multiple-input multiple-output(MIMO)visible light communication(VLC)system is investigated under the peak,average optical and electrical power constraints.Finding the channel capacity of MIMO VLC is shown to be a mixed integer programming problem.To address this open problem,we propose an inexact gradient projection method to find the channel capacity-achieving discrete input distribution and the channel capacity of MIMO VLC.Also we derive both upper and lower bounds of the capacity of MIMO VLC with the closed-form expressions.Furthermore,by considering practical discrete constellation inputs,we develop the optimal power allocation scheme to maximize transmission rate of MIMO VLC system.Simulation results show that more discrete points are needed to achieve the channel capacity as SNR increases.Both the upper and lower bounds of channel capacity are tight at low SNR region.In addition,comparing the equal power allocation,the proposed power allocation scheme can significantly increase the rate for the low-order modulation inputs. 展开更多
关键词 visible light communication MIMO discrete constellation inputs power allocation
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Double Layer Composite Electrode Strategy for Efficient Perovskite Solar Cells with Excellent Reverse-Bias Stability
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作者 Chaofan Jiang Junjie Zhou +6 位作者 hang li liguo Tan Minghao li Wolfgang Tress liming Ding Michael Grätzel Chenyi Yi 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第1期225-235,共11页
Perovskite solar cells(PSCs)have become the represent-atives of next generation of photovoltaics;nevertheless,their stability is insufficient for large scale deployment,particularly the reverse bias stability.Here,we ... Perovskite solar cells(PSCs)have become the represent-atives of next generation of photovoltaics;nevertheless,their stability is insufficient for large scale deployment,particularly the reverse bias stability.Here,we propose a transparent conducting oxide(TCO)and low-cost metal composite electrode to improve the stability of PSCs without sacrificing the efficiency.The TCO can block ion migrations and chemical reactions between the metal and perovskite,while the metal greatly enhances the conductivity of the composite electrode.As a result,composite electrode-PSCs achieved a power conversion efficiency(PCE)of 23.7%(certified 23.2%)and exhibited excellent stability,maintaining 95%of the initial PCE when applying a reverse bias of 4.0 V for 60 s and over 92%of the initial PCE after 1000 h continuous light soaking.This composite electrode strategy can be extended to different combinations of TCOs and metals.It opens a new avenue for improving the stability of PSCs. 展开更多
关键词 Composite electrode Perovskite solar cells STABILITY Reverse bias Characterization
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2019—2023年泰州市稻米中4种元素污染特征及健康风险评估
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作者 乔秋菊 杭莉 +2 位作者 邢怡晨 刁春霞 卢克贵 《现代食品》 2024年第11期167-173,187,共8页
目的:了解泰州市生产的稻米中总铬、总砷、镉、铅4种元素含量及污染状况,评估居民食用稻米引起的健康风险。方法:2019—2023年,每年采集40份新鲜成熟的稻米,共采集200份稻米。稻米自然晾干后去壳打碎,利用电感耦合等离子质谱法同时测定... 目的:了解泰州市生产的稻米中总铬、总砷、镉、铅4种元素含量及污染状况,评估居民食用稻米引起的健康风险。方法:2019—2023年,每年采集40份新鲜成熟的稻米,共采集200份稻米。稻米自然晾干后去壳打碎,利用电感耦合等离子质谱法同时测定总铬、总砷、镉、铅4种元素的含量。结果:2019—2023年,泰州市生产的稻米中总铬、总砷、镉、铅含量均值分别为0.385 mg·kg^(-1)、0.136 mg·kg^(-1)、0.0289 mg·kg^(-1)、0.0114 mg·kg^(-1)。200份稻米样品中镉和铅元素含量均低于国家标准限量值,通过单因子污染指数值和内梅罗综合污染指数值判断稻米中镉和铅元素处于优良水平,稻米中镉和铅对人群健康的影响风险处于可接受水平;8份稻米样品中总铬含量超标,总铬含量整体处于轻度以下污染水平,总铬对人群健康的影响风险处于可接受水平;2份稻米样品中总砷含量超标,2021年总砷处于轻度以下污染水平,总砷对成人和儿童群体的健康具有一定的影响,但慢性毒效应较低。结论:泰州市新鲜稻米中总铬和总砷略有污染,砷对人体健康具有慢性影响,需进一步对稻米中砷含量进行精细化分析和评估。 展开更多
关键词 稻米 污染 风险评估
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熔体过热和脉冲磁场协同处理对Mn_(5)Si_(3)增强Cu-35Zn-3Al合金显微组织、力学和耐磨性能的影响
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作者 李航 牛冬涛 +3 位作者 张忠涛 杨帆 王红霞 程伟丽 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第3期918-934,共17页
研究熔体过热和脉冲磁场协同处理对Mn_(5)Si_(3)增强Cu-35Zn-3Al合金显微组织、力学和耐磨性能的影响。研究结果表明,协同处理促进了熔体中的溶质迁移以及Mn_(5)Si_(3)晶体生长的吸附动力学,抑制了六棱柱形貌Mn_(5)Si_(3)颗粒上孔洞的... 研究熔体过热和脉冲磁场协同处理对Mn_(5)Si_(3)增强Cu-35Zn-3Al合金显微组织、力学和耐磨性能的影响。研究结果表明,协同处理促进了熔体中的溶质迁移以及Mn_(5)Si_(3)晶体生长的吸附动力学,抑制了六棱柱形貌Mn_(5)Si_(3)颗粒上孔洞的形成。协同处理后热锻态合金的抗拉强度和伸长率分别提高了9.0%和66.5%,这是由于拉伸变形过程中不含孔洞的Mn_(5)Si_(3)颗粒断裂强度提高,产生的应力集中减小,因此失效方式由脆性解理断裂转变为从基体中拔出,颗粒和基体间的载荷传递作用增强。在承受摩擦时,协同处理后合金的磨损亚表层中Mn_(5)Si_(3)颗粒不易发生剪切断裂,抑制了裂纹扩展和材料剥落,因而产生的剥层磨损减小,合金耐磨性显著提高。 展开更多
关键词 复杂黄铜 Mn_(5)Si_(3)相 脉冲磁场 强化机理 耐磨性
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Experimental observations on the nonproportional multiaxial ratchetting of cast AZ91 magnesium alloy at room temperature
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作者 Binghui Hu Yu Lei +3 位作者 hang li Ziyi Wang Chao Yu Guozheng Kang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第5期1115-1125,共11页
The nonproportional multiaxial ratchetting of cast AZ91 magnesium (Mg) alloy was examined by performing a sequence of axial-torsional cyclic tests controlled by stress with various loading paths at room temperature (R... The nonproportional multiaxial ratchetting of cast AZ91 magnesium (Mg) alloy was examined by performing a sequence of axial-torsional cyclic tests controlled by stress with various loading paths at room temperature (RT).The evolutionary characteristics and path dependence of multiaxial ratchetting were discussed.Results illustrate that the cast AZ91 Mg alloy exhibits considerable nonproportional additional softening during cyclic loading with multiple nonproportional multiaxial loading paths;multiaxial ratchetting presents strong path dependence,and axial ratchetting strains are larger under nonproportional loading paths than under uniaxial and proportional45°linear loading paths;multiaxial ratchetting becomes increasingly pronounced as the applied stress amplitude and axial mean stress increase.Moreover,stress-strain curves show a convex and symmetrical shape in axial/torsional directions.Multiaxial ratchetting exhibits quasi-shakedown after certain loading cycles.The abundant experimental data obtained in this work can be used to develop a cyclic plasticity model of cast Mg alloys. 展开更多
关键词 cast magnesium alloy RATCHETTING multiaxial loading loading path stress level
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Theoretical and Experimental Study on the Performance of Hermetic Diaphragm Squeeze Film Dampers for Gas-Lubricated Bearings
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作者 Jianwei Wang Haoxi Zhang +3 位作者 Shaocun Han hang li Peng Wang Kai Feng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2024年第3期151-169,共19页
Low damping characteristics have always been a key sticking points in the development of gas bearings.The application of squeeze film dampers can significantly improve the damping performance of gas lubricated bearing... Low damping characteristics have always been a key sticking points in the development of gas bearings.The application of squeeze film dampers can significantly improve the damping performance of gas lubricated bearings.This paper proposed a novel hermetic diaphragm squeeze film damper(HDSFD)for oil-free turbomachinery supported by gas lubricated bearings.Several types of HDSFDs with symmetrical structure were proposed for good damping performance.By considering the compressibility of the damper fluid,based on hydraulic fluid mechanics theory,a dynamic model of HDSFDs under medium is proposed,which successfully reflects the frequency dependence of force coefficients.Based on the dynamic model,the effects of damper fluid viscosity,bulk modulus of damper fluid,thickness of damper fluid film and plunger thickness on the dynamic stiffness and damping of HDSFDs were analyzed.An experimental test rig was assembled and series of experimental studies on HDSFDs were conducted.The damper fluid transverse flow is added to the existing HDSFD concept,which aims to make the dynamic force coefficients independent of frequency.Although the force coefficient is still frequency dependent,the damping coefficient at high frequency excitation with damper fluid supply twice as that without damper fluid supply.The results serve as a benchmark for the calibration of analytical tools under development. 展开更多
关键词 Hermetic diaphragm squeeze film damper COMPRESSIBILITY Dynamic model Experimental studies
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Role of micro-Ca/In alloying in tailoring the microstructural characteristics and discharge performance of dilute Mg-Bi-Sn-based alloys as anodes for Mg-air batteries
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作者 Fei-er Shangguan Wei-li Cheng +6 位作者 Yu-hang Chen Ze-qin Cui Hui Yu Hong-xia Wang li-fei Wang hang li Hua Hou 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第1期251-266,共16页
The influence of micro-Ca/In alloying on the microstructural charac teristics,electrochemical behaviors and discharge properties of extruded dilute Mg-0.5Bi-0.5Sn-based(wt.%)alloys as anodes for Mg-air batteries are e... The influence of micro-Ca/In alloying on the microstructural charac teristics,electrochemical behaviors and discharge properties of extruded dilute Mg-0.5Bi-0.5Sn-based(wt.%)alloys as anodes for Mg-air batteries are evaluated.The grain size and texture intensity of the Mg-Bi-Sn-based alloys are significantly decreased after the Ca/In alloying,particularly for the In-containing alloy.Note that,in addition to nanoscale Mg_(3)Bi_(2)phase,a new microscale Mg_(2)Bi_(2)Ca phase forms in the Ca-containing alloy.The electrochemical test results demonstrate that Ca/In micro-alloying can enhance the electrochemical activity.Using In to alloy the Mg-Bi-Sn-based alloy is effective in restricting the cathodic hydrogen evolution(CHE)kinetics,leading to a low self-corrosion rate,while severe CHE occurred after Ca alloying.The micro-alloying of Ca/In to Mg-Bi-Sn-based alloy strongly deteriorates the compactness of discharge products film and mitigates the"chunk effect"(CE),hence the cell voltage,anodic efficiency as well as discharge capacity are greatly improved.The In-containing alloy exhibits outstanding discharge performance under the combined effect of the modified microstructure and discharge products,thus making it a potential anode material for primary Mg-air battery. 展开更多
关键词 Mg-air batteries Mg-Bi-Sn based alloys Electrochemical behaviors Discharge properties
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Tamping the movement of the laser absorption cutoff position using gold foam hohlraum
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作者 张璐 李丽灵 +14 位作者 林稚伟 董云松 景龙飞 郑建华 况龙钰 黎航 郑金华 张继彦 宋天明 张志宇 赵阳 牛高 杨冬 杨家敏 丁永坤 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第5期56-61,共6页
In indirect-driven laser fusion experiments,the movement of the laser absorption layer will distort the radiation uniformity on the capsule.The gold foam has advantages in symmetry control and lowering wall plasma blo... In indirect-driven laser fusion experiments,the movement of the laser absorption layer will distort the radiation uniformity on the capsule.The gold foam has advantages in symmetry control and lowering wall plasma blowoff when used in an inertial confinement fusion(ICF)hohlraum.This work investigates the motion of the laser absorption cutoff position using lowdensity foam gold walls.It is found that the motion of the laser absorption cutoff position can be significantly mitigated through optimal initial low density,tailored to a specific laser shape.For a short square laser pulse,the laser absorption cutoff position remains almost stationary at an initial density of approximately 0.6 g cm^(-3).For a long-shaped laser pulse,the minimal motion of the laser absorption cutoff position is observed at an initial density of about 0.1 g cm^(-3).This approach allows for the adjustment of the symmetry of the hohlraum radiation source.The insights gained from this study serve as a crucial reference for optimizing the hohlraum wall density. 展开更多
关键词 hohlraum symmetry laser absorption plasma blowoff gold foam
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Quafu-Qcover:Explore combinatorial optimization problems on cloud-based quantum computers
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作者 许宏泽 庄伟峰 +29 位作者 王正安 黄凯旋 时运豪 马卫国 李天铭 陈驰通 许凯 冯玉龙 刘培 陈墨 李尚书 杨智鹏 钱辰 靳羽欣 马运恒 肖骁 钱鹏 顾炎武 柴绪丹 普亚南 张翼鹏 魏世杰 增进峰 李行 龙桂鲁 金贻荣 于海峰 范桁 刘东 胡孟军 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第5期104-115,共12页
We introduce Quafu-Qcover,an open-source cloud-based software package developed for solving combinatorial optimization problems using quantum simulators and hardware backends.Quafu-Qcover provides a standardized and c... We introduce Quafu-Qcover,an open-source cloud-based software package developed for solving combinatorial optimization problems using quantum simulators and hardware backends.Quafu-Qcover provides a standardized and comprehensive workflow that utilizes the quantum approximate optimization algorithm(QAOA).It facilitates the automatic conversion of the original problem into a quadratic unconstrained binary optimization(QUBO)model and its corresponding Ising model,which can be subsequently transformed into a weight graph.The core of Qcover relies on a graph decomposition-based classical algorithm,which efficiently derives the optimal parameters for the shallow QAOA circuit.Quafu-Qcover incorporates a dedicated compiler capable of translating QAOA circuits into physical quantum circuits that can be executed on Quafu cloud quantum computers.Compared to a general-purpose compiler,our compiler demonstrates the ability to generate shorter circuit depths,while also exhibiting superior speed performance.Additionally,the Qcover compiler has the capability to dynamically create a library of qubits coupling substructures in real-time,utilizing the most recent calibration data from the superconducting quantum devices.This ensures that computational tasks can be assigned to connected physical qubits with the highest fidelity.The Quafu-Qcover allows us to retrieve quantum computing sampling results using a task ID at any time,enabling asynchronous processing.Moreover,it incorporates modules for results preprocessing and visualization,facilitating an intuitive display of solutions for combinatorial optimization problems.We hope that Quafu-Qcover can serve as an instructive illustration for how to explore application problems on the Quafu cloud quantum computers. 展开更多
关键词 quantum cloud platform combinatorial optimization problems quantum software
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Quafu-RL:The cloud quantum computers based quantum reinforcement learning
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作者 靳羽欣 许宏泽 +29 位作者 王正安 庄伟峰 黄凯旋 时运豪 马卫国 李天铭 陈驰通 许凯 冯玉龙 刘培 陈墨 李尚书 杨智鹏 钱辰 马运恒 肖骁 钱鹏 顾炎武 柴绪丹 普亚南 张翼鹏 魏世杰 曾进峰 李行 龙桂鲁 金贻荣 于海峰 范桁 刘东 胡孟军 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第5期29-34,共6页
With the rapid advancement of quantum computing,hybrid quantum–classical machine learning has shown numerous potential applications at the current stage,with expectations of being achievable in the noisy intermediate... With the rapid advancement of quantum computing,hybrid quantum–classical machine learning has shown numerous potential applications at the current stage,with expectations of being achievable in the noisy intermediate-scale quantum(NISQ)era.Quantum reinforcement learning,as an indispensable study,has recently demonstrated its ability to solve standard benchmark environments with formally provable theoretical advantages over classical counterparts.However,despite the progress of quantum processors and the emergence of quantum computing clouds,implementing quantum reinforcement learning algorithms utilizing parameterized quantum circuits(PQCs)on NISQ devices remains infrequent.In this work,we take the first step towards executing benchmark quantum reinforcement problems on real devices equipped with at most 136 qubits on the BAQIS Quafu quantum computing cloud.The experimental results demonstrate that the policy agents can successfully accomplish objectives under modified conditions in both the training and inference phases.Moreover,we design hardware-efficient PQC architectures in the quantum model using a multi-objective evolutionary algorithm and develop a learning algorithm that is adaptable to quantum devices.We hope that the Quafu-RL can be a guiding example to show how to realize machine learning tasks by taking advantage of quantum computers on the quantum cloud platform. 展开更多
关键词 quantum cloud platform quantum reinforcement learning evolutionary quantum architecture search
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Spontaneous dislodgment of a peritoneal dialysis catheter inserted using the Seldinger technique:A case report
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作者 Ruo-Yu Wu Yao Tan +3 位作者 hang li Yu-Rong Zou Xiu-ling Chen Jin Chen 《World Journal of Clinical Cases》 SCIE 2024年第21期4789-4793,共5页
BACKGROUND Peritoneal dialysis(PD)is an important renal replacement therapy in patients with end-stage renal disease.PD catheters remain the lifeline for patients undergoing PD.The catheter technique survival rate is ... BACKGROUND Peritoneal dialysis(PD)is an important renal replacement therapy in patients with end-stage renal disease.PD catheters remain the lifeline for patients undergoing PD.The catheter technique survival rate is considered a core PD outcome domain.CASE SUMMARY The PD catheter spontaneously dislodged in a patient undergoing PD during regular fluid exchange without pain.Abdominal computed tomography showed a tunnel infection.A double-cuff straight Tenckhoff catheter had been inserted using the Seldinger technique.Before this incident,the patient had a history of tunnel infections.We speculate that recurrent tunnel infections and catheter insertion using the Seldinger technique may have led to catheter dislodgement.CONCLUSION The present case suggests that clinicians should more rigorously assess the persistence of catheter-related infections concerning the potential complications arising from catheter dislodgement associated with the Seldinger technique. 展开更多
关键词 CATHETER DISLODGMENT Seldinger technique INFECTION Peritoneal dialysis Case report
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Platelet count combined with right liver volume and spleen volume measured by magnetic resonance imaging for identifying cirrhosis and esophageal varices 被引量:11
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作者 Xiao-li Chen Tian-Wu Chen +7 位作者 Xiao-Ming Zhang Zhen-lin li Nan-lin Zeng Ping Zhou hang li Jing Ren Guo-Hui Xu Jia-Ni Hu 《World Journal of Gastroenterology》 SCIE CAS 2015年第35期10184-10191,共8页
AIM: To determine whether the combination of platelet count(PLT) with spleen volume parameters and right liver volume(RV) measured by magnetic resonance imaging(MRI) could predict the Child-Pugh class of liver cirrhos... AIM: To determine whether the combination of platelet count(PLT) with spleen volume parameters and right liver volume(RV) measured by magnetic resonance imaging(MRI) could predict the Child-Pugh class of liver cirrhosis and esophageal varices(EV).METHODS: Two hundred and five cirrhotic patients with hepatitis B and 40 healthy volunteers underwent abdominal triphasic-enhancement MRI and laboratory examination of PLT in 109/L. Cirrhotic patients underwent endoscopy for detecting EV. Spleen maximal width(W), thickness(T) and length(L) in mm together with spleen volume(SV) and RV in mm3 were measured by MRI, and spleen volume index(SI) in mm3 was obtained by W × T × L. SV/PLT, SI/PLT and RV × PLT/SV(RVPS) were calculated and statistically analyzed to assess cirrhosis and EV.RESULTS: SV/PLT(r = 0.676) and SI/PLT(r = 0.707) increased, and PLT(r =-0.626) and RVPS(r =-0.802) decreased with the progress of Child-Pugh class(P < 0.001 for all). All parameters could determine the presence of cirrhosis, distinguish between each class of Child-Pugh class, and identify the presence of EV [the areas under the curve(AUCs) = 0.661-0.973]. A m o n g p a ra m e t e r s, R V P S c o u l d b e s t d e t e r m i n e presence and each class of cirrhosis with AUCs of 0.973 and 0.740-0.853, respectively; and SV/PLT could best identify EV with an AUC of 0.782.CONCLUSION: The combination of PLT with SV and RV could predict Child-Pugh class of liver cirrhosis and identify the presence of esophageal varices. 展开更多
关键词 CIRRHOSIS SPLEEN HEPATIC LOBE Magnetic resonance i
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Review on cyclic plasticity of magnesium alloys:Experiments and constitutive models 被引量:12
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作者 Guo-zheng Kang hang li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第4期567-589,共23页
Fatigue analysis has always been a concern in the design and assessment of Mg alloy structure components subjected to cyclic loading,and research on the cyclic plasticity is fundamental to investigate the correspondin... Fatigue analysis has always been a concern in the design and assessment of Mg alloy structure components subjected to cyclic loading,and research on the cyclic plasticity is fundamental to investigate the corresponding fatigue failure.Thus,this work reviews the progress in the cyclic plasticity of Mg alloys.First,the existing macroscopic and microscopic experimental results of Mg alloys are summarized.Then,corresponding macroscopic phenomenological constitutive models and crystal plasticity-based models are reviewed.Finally,some conclusions and recommended topics on the cyclic plasticity of Mg alloys are provided to boost the further development and application of Mg alloys. 展开更多
关键词 magnesium alloy cyclic plasticity macroscopic experiments microscopic observations constitutive model
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Albumin and magnetic resonance imaging-liver volume to identify hepatitis B-related cirrhosis and esophageal varices 被引量:10
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作者 hang li Tian-Wu Chen +6 位作者 Zhen-lin li Xiao-Ming Zhang Cheng-Jun li Xiao-li Chen Guang-Wen Chen Jia-Ni Hu Yong-Quan Ye 《World Journal of Gastroenterology》 SCIE CAS 2015年第3期988-996,共9页
AIM:To investigate whether liver lobe volume and albumin(ALB) could predict the presence and severity of liver cirrhosis,and esophageal varices.METHODS:Seventy-one cirrhotic patients with hepatitis B and 21 healthy in... AIM:To investigate whether liver lobe volume and albumin(ALB) could predict the presence and severity of liver cirrhosis,and esophageal varices.METHODS:Seventy-one cirrhotic patients with hepatitis B and 21 healthy individuals were enrolled in this study.All the participants underwent abdominal enhanced magnetic resonance imaging to measure each liver lobe volume,and biochemical workup for testing ALB and Child-Pugh class.All cirrhotic patients underwent upper gastrointestinal endoscopy to show the presence of cirrhotic esophageal varices.Right liver lobe volume(RV),left medial liver lobe volume(LMV),left lateral liver lobe volume(LLV),and caudate lobe volume(CV) were measured using enhanced magnetic resonance imaging.The ratios of RV to ALB(RV/ALB),LMV to ALB(LMV/ALB),LLV to ALB(LLV/ALB) and CV to ALB(CV/ALB) were calculated.Statistical analyses were performed to determine whether and how the combination of liver lobe volume measured using magnetic resonance imaging and albumin could predict the presence and severity of liver cirrhosis,and the presence of esophageal varices.RESULTS:RV,LMV,LLV and CV decreased(r =-0.51-0.373; all P < 0.05),while RV/ALB increased(r = 0.424; P < 0.05),with the progress of Child-Pugh classof liver cirrhosis.RV,LMV,CV,LLV/ALB and CV/ALB could identify presence of liver cirrhosis; LLV and LMV could distinguish Child-Pugh class A from B; RV,LMV,LLV,CV,RV/ALB and LLV/ALB could distinguish class A from C; RV and LLV/ALB could differentiate B from C; and RV,RV/ALB and CV/ALB could identify presence of esophageal varices(all P < 0.05).Among these parameters,CV/ALB could best identify the presence of liver cirrhosis,with an area under receiver operating characteristic curve(AUC) of 0.860,a sensitivity of 82.0% and a specificity of 83.0%.LLV could best distinguish class A from B,with an AUC of 0.761,a sensitivity of 74.4% and a specificity of 73.1%.RV could best distinguish class A from C,with an AUC of 0.900,a sensitivity of 90.3% and a specificity of 84.5%.LLV/ALB could best distinguish class B from C,with an AUC of 0.900,a sensitivity of 93.8% and a specificity of 81.5%.RV/ALB could best identify esophageal varices,with an AUC of 0.890,a sensitivity of 80.0% and a specificity of 83.5%.CONCLUSION:The combination of liver lobe volume and ALB has potential to identify presence and severity of cirrhosis,and presence of esophageal varices. 展开更多
关键词 Magnetic RESONANCE imaging LIVER CIRRHOSIS LIVER l
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