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Cynanchum atratum Bunge and Cynanchum versicolor Bunge for Baiwei:An updated review of their botany,phytochemistry,traditional uses and pharmacological activities
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作者 wei xie Xin-yang Liu +1 位作者 Xia Li Yong-sheng Jin 《Journal of Integrative Medicine》 2025年第3期230-255,共26页
Cynanchum atratum Bunge(C.atratum)and Cynanchum versicolor Bunge(C.versicolor)are two related species that have been used as“Baiwei”(Cynanchi Atrati Radix Et Rhizoma)in traditional medicine in China and other Asian ... Cynanchum atratum Bunge(C.atratum)and Cynanchum versicolor Bunge(C.versicolor)are two related species that have been used as“Baiwei”(Cynanchi Atrati Radix Et Rhizoma)in traditional medicine in China and other Asian countries for a long time.However,to date,no comprehensive review of C.atratum and C.versicolor has been published.This review provides a comprehensive summary on the botany,phytochemistry,traditional uses and pharmacology of Baiwei;The authors focus especially on the revision of errors in previous articles and reviews,updating information and providing a comparison of C.atratum and C.versicolor.Furthermore,current research reveals significant disparities in the chemical composition and pharmacological effects between C.atratum and C.versicolor.Up to November 2023,178 compounds have been isolated from C.atratum and C.versicolor,including C_(21)steroids,acetophenones,alkaloids and volatile oils.These compounds and extracts have been proven to exhibit significant pharmacological activities,including anti-inflammatory,anti-tumor,anti-virus,anti-fungal,memoryenhancing and anti-pyretic action,immune modulatory effects,reducing blood lipid,inhibition of melanin production,and anti-parasitic effects.Therefore,this review presents new insights into these two herbs used as“Baiwei”and further study is warranted to enhance their clinical application. 展开更多
关键词 Cynanchum atratum Cynanchum versicolor C_(21)steroids Antofine Pharmacology
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Light-weight refractory high-entropy alloys: A comprehensive review 被引量:13
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作者 Zechun Wang Shiyao Chen +5 位作者 Shenglan Yang Qun Luo Yancheng Jin wei xie Lijun Zhang Qian Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第20期41-65,共25页
In recent years,high-entropy alloys(HEAs)have become a research hotspot in materials community,and great progress has been made in exploring various high-performance HEAs.As a special class,the light-weight refractory... In recent years,high-entropy alloys(HEAs)have become a research hotspot in materials community,and great progress has been made in exploring various high-performance HEAs.As a special class,the light-weight refractory high-entropy alloys(RHEAs)own both excellent high-temperature comprehensive properties and low density and have accordingly attracted more and more attention.In this paper,we presented a comprehensive review of the recent progress and status in light-weight RHEAs.Based on an exhausting search of the literature reports,one strategy in terms of phase numbers after preparation was first proposed to classify the light-weight RHEAs into three categories.Then,the status on the fundamental thermodynamic and thermophysical data/databases,computational approaches for alloy designing,and preparation/fabrication techniques of light-weight RHEAs was introduced one after another.After that,the progress on mechanical properties and oxidation/corrosion/wear behaviors of light-weight RHEAs at room and high temperatures was summarized.Finally,the conclusions of this review were drawn.By pointing out the shortcomings of the current research,the follow-up development directions in the field of light-weight RHEAs were also given. 展开更多
关键词 Refractory high-entropy alloys Light weight Alloy design Mechanical property OXIDATION Corrosion
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Vehicle Head and Tail Recognition Algorithm for Lightweight DCDSNet
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作者 Chao Wang Kaijie Zhang +3 位作者 Xiaoyong Yu Dejun Li wei xie Xinqiao Wang 《Computers, Materials & Continua》 SCIE EI 2024年第9期4451-4473,共23页
In the model of the vehicle recognition algorithm implemented by the convolutional neural network,the model needs to compute and store a lot of parameters.Too many parameters occupy a lot of computational resources ma... In the model of the vehicle recognition algorithm implemented by the convolutional neural network,the model needs to compute and store a lot of parameters.Too many parameters occupy a lot of computational resources making it difficult to run on computers with poor performance.Therefore,obtaining more efficient feature information of target image or video with better accuracy on computers with limited arithmetic power becomes the main goal of this research.In this paper,a lightweight densely connected,and deeply separable convolutional network(DCDSNet)algorithmis proposed to achieve this goal.Visual Geometry Group(VGG)model is improved by utilizing the convolution instead of the fully connected module,the deeply separable convolution module,and the densely connected network module,with the first two modules reducing the parameters and the third module allowing the algorithm to have more features in a limited number of parameters.The algorithm achieves better results in the mine vehicle recognition dataset.Experiments show that the recognition accuracy is improved by 4.41% compared to VGG19 and the amount of parameters is reduced by 71% compared to VGG19. 展开更多
关键词 VGGNet vehicle head and tail recognition densely connected depthwise separable convolutional
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In Situ Partial-Cyclized Polymerized Acrylonitrile-Coated NCM811 Cathode for High-Temperature≥100℃ Stable Solid-State Lithium Metal Batteries 被引量:1
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作者 Jiayi Zheng Haolong Jiang +13 位作者 xieyu Xu Jie Zhao Xia Ma weiwei Sun Shuangke Liu wei xie Yufang Chen ShiZhao Xiong Hui Wang Kai xie Yu Han Maoyi Yi Chunman Zheng Qingpeng Guo 《Nano-Micro Letters》 2025年第8期399-415,共17页
High-nickel ternary cathodes hold a great application prospect in solid-state lithium metal batteries to achieve high-energy density,but they still suffer from structural instability and detrimental side reactions wit... High-nickel ternary cathodes hold a great application prospect in solid-state lithium metal batteries to achieve high-energy density,but they still suffer from structural instability and detrimental side reactions with the solid-state electrolytes.To circumvent these issues,a continuous uniform layer polyacrylonitrile(PAN)was introduced on the surface of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2) via in situ polymerization of acrylonitrile(AN).Furthermore,the partial-cyclized treatment of PAN(cPAN)coating layer presents high ionic and electron conductivity,which can accelerate interfacial Li+and electron diffusion simultaneously.And the thermodynamically stabilized cPAN coating layer cannot only effectively inhibit detrimental side reactions between cathode and solid-state electrolytes but also provide a homogeneous stress to simultaneously address the problems of bulk structural degradation,which contributes to the exceptional mechanical and electrochemical stabilities of the modified electrode.Besides,the coordination bond interaction between the cPAN and NCM811 can suppress the migration of Ni to elevate the stability of the crystal structure.Benefited from these,the In-cPAN-260@NCM811 shows excellent cycling performance with a retention of 86.8%after 300 cycles and superior rate capability.And endow the solid-state battery with thermal safety stability even at hightemperature extreme environment.This facile and scalable surface engineering represents significant progress in developing high-performance solid-state lithium metal batteries. 展开更多
关键词 Solid-state lithium metal battery Ni-rich cathode Interface engineering In situ partial-cyclized PAN High-temperature resistance
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Unraveling the CMAS corrosion mechanism of CrTaO_(4): A promising dual function oxidation and thermal protection material for RHEAs
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作者 Shuang Zhang Xiaohui Wang +4 位作者 Huimin Xiang Cheng Fang wei xie Hailong Wang Yanchun Zhou 《Journal of Materials Science & Technology》 2025年第30期80-93,共14页
CrTaO_(4)has been found to play a pivotal role in the protection of refractory high-entropy alloys(RHEAs)from high-temperature oxidation and thermal attack due to its high melting point,low thermal conductivity,close ... CrTaO_(4)has been found to play a pivotal role in the protection of refractory high-entropy alloys(RHEAs)from high-temperature oxidation and thermal attack due to its high melting point,low thermal conductivity,close thermal expansion coefficient(TEC)to RHEAs.These appealing properties enable CrTaO_(4)as a new type of protective scale material for high-temperature applications such as in air breathing jet engines.For such engine applications,CaO-MgO-Al_(2)O_(3)-SiO_(2)(CMAS)corrosion is a critical issue.However,the corrosion behavior of CrTaO_(4)under CMAS attack remains unknown so far.Here,the corrosion resistance of CrTaO_(4)to molten CMAS is comprehensively studied.It is demonstrated that the CMAS corrosion resistance is significantly superior over commercial yttria-stabilized zirconia and the commonly investigated thermal barrier coating materials.Element and phase compositional analyses indicate dense and CMAS corrosion-resistant layers are established between CMAS and the CrTaO_(4)substrate.The interface reaction between the CrTaO_(4)substrate and CMAS at 1250 and 1300℃gives rise to a dense layer composed of CaTa_(2)O_(6) and Mg(Cr,Al)_(2)O_(4)spinel just beneath the molten CMAS.At 1350℃,a phase composition gradient layer,composed of crystalline phases CaTa_(2)O_(6)/CaTa_(2)O_(6)+Mg(Cr,Al)_(2)O_(4)/CaTa_(2)O_(6)+Cr2O_(3),is formed.With increased calcium consumption due to more Ca-containing crystalline phase formation upon elevating temperature,the Ca/Si ratio in CMAS melt declines,thereby increasing the viscosity of the melt and mitigating the penetration of CMAS into the CrTaO_(4)substrate. 展开更多
关键词 CrTaO_(4) CMAS corrosion Thermal barrier materials Refractory high-entropy alloys Corrosion mechanism STEM Rutile structured Ceramics Atomic resolution microstructure
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Ginsenoside F4 inhibits colorectal cancer progression by boosting dendritic cell maturation and remodeling the tumor microenvironment
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作者 wei xie Xue-Jian Li +5 位作者 Yu-Sen Zhong Jie Fang Hui Qi Meng Yang Hua-Zhong Ying Chen-Huan Yu 《World Journal of Gastrointestinal Oncology》 2025年第9期270-287,共18页
BACKGROUND Immunotherapy that employs dendritic cells(DCs)to activate the patient’s im-mune system has emerged as a promising therapeutic strategy to combat cancer;however,effective targeting agents are still limited... BACKGROUND Immunotherapy that employs dendritic cells(DCs)to activate the patient’s im-mune system has emerged as a promising therapeutic strategy to combat cancer;however,effective targeting agents are still limited.Ginsenoside F4,as a rare ginsenoside found in Panax ginseng,exhibits stronger antitumor and immunomo-dulatory activities than primary ginsenosides.However,its therapeutic effects on various diseases remain limited.AIM To investigate the antitumor effect of Ginsenoside F4 and mechanism on the maturation of DCs in colorectal cancer(CRC).METHODS The changes in mature DC markers and cytokines generated after DCs were exposed to F4 were assessed using flow cytometry and enzyme-linked immuno-sorbent assay,respectively.The viability of CRC CT26 cells co-cultured with T lymphocytes was monitored by cell counting kit-8 assay.Furthermore,the histopathological characteristics and immune cell infiltration in tumor tissues of CT26-bearing mice were analyzed by hematoxylin-eosin and immuno-fluorescent staining.The expressions of apoptosis-relative proteins were detected by western blot assay.RESULTS Treatment with F4 promoted the maturation of DCs,elevated the expressions of cluster of differentiation(CD)83 and CD86,increased the secretion of interleukin(IL)-2,IL-10,and IL-12 p70,and upregulated the expressions of phosphorylated phosphoinositide 3-kinase,phosphorylated protein kinase B,and nuclear factor kappa-B(NF-κB)phosphorylated p65 in DCs,which enhanced antigen-specific CD8+T-cell responses.However,these benefits could be reversed by the sphingosine-1-phosphate 1(S1PR1)inhibitor fingolimod hydrochloride.Furthermore,oral administration with F4 inhibited tumor growth and increased DC and CD8+T-cell infiltration in the tumor tissues of CT26-bearing mice.CONCLUSION The results demonstrated that F4 inhibited the growth of CRC by maturing DCs through activating S1PR1-mediated phosphoinositide 3-kinase/protein kinase B and NF-κB pathways,which triggered the antitumor effects of CD8+T cells.Therefore,F4 could serve as an antitumor immunomodulator for CRC treatment. 展开更多
关键词 Colorectal cancer Cytotoxic T lymphocyte Dendritic cells GINSENOSIDES Sphingosine-1-phosphate 1 Tumor microenvironment
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Size-dependent toxicity of microplastics induced gut cell apoptosis in brine shrimp Artemia parthenogenetica through p53 signaling pathway
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作者 Junfang WANG Zhichao YAN +2 位作者 Yulong LU wei xie Liying SUI 《Journal of Oceanology and Limnology》 2025年第2期614-623,共10页
Microplastics(MPs)are one of the most concerning pollutants that affects the health and growth of aquatic organisms.We characterized the MPs dispersion in the milli-Q water and seawater,and evaluated the effects of MP... Microplastics(MPs)are one of the most concerning pollutants that affects the health and growth of aquatic organisms.We characterized the MPs dispersion in the milli-Q water and seawater,and evaluated the effects of MPs on the gut epithelial cells of brine shrimp using three sizes of polystyrene(PS)microbeads(0.05,0.5,and 5μm,respectively).Results show that microbeads evenly dispersed in milli-Q water,but exhibited aggregation tendency in seawater associating with the particle size.Apart from a reduced survival rate,we observed the structure changes in the gut epithelium that the smaller size of PS microbeads resulted in an increased reactive oxygen species(ROS)and higher apoptosis-related genes expression.Moreover,exposure to all size of PS microbeads led to increased green fluorescence of J-monomer,indicating the declined mitochondrial membrane potential.Therefore,exposure to PS microbeads led to significantly size-dependent toxicity on brine shrimp.Especially,0.05-μm PS microbeads were more toxic,leading to severe oxidative stress and activation of the p53-Bax-Bcl2 pathway,ultimately resulting in cellular apoptosis and gut damage.These findings are important to understand the mechanism of MPs toxicity and its potential ecological risks to marine aquatic animals. 展开更多
关键词 polystyrene microplastic brine shrimp GUT oxidative stress apoptosis-related gene mitochondrial membrane potential
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An Inner-Element Edge-Based Smoothed Finite Element Method
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作者 Zhigang Pei wei xie +1 位作者 Tao Suo Zhimin Xu 《Acta Mechanica Solida Sinica》 2025年第5期815-824,共10页
A modified inner-element edge-based smoothed finite element method(IES-FEM)is developed and integrated with ABAQUS using a user-defined element(UEL)in this study.Initially,the smoothing domain discretization of IES-FE... A modified inner-element edge-based smoothed finite element method(IES-FEM)is developed and integrated with ABAQUS using a user-defined element(UEL)in this study.Initially,the smoothing domain discretization of IES-FEM is described and compared with ES-FEM.A practical modification of IES-FEM is then introduced that used the technique employed by ES-FEM for the nodal strain calculation.The differences in the strain computation among ES-FEM,IES-FEM,and FEM are then discussed.The modified IES-FEM exhibited superior performance in displacement and a slight advantage in stress compared to FEM using the same mesh according to the results obtained from both the regular and irregular elements.The robustness of the IES-FEM to severely deformed meshes was also verified. 展开更多
关键词 Smoothed finite element method(S-FEM) Edge-based smoothed finite element method(ES-FEM) User-defined element(UEL) Stress analysis Displacement analysis
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A novel method for measuring interaction among multiple objectives in reservoir operation using niche theory
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作者 Xiao-kuan Ni Zeng-chuan Dong +6 位作者 Wen-hao Jia Wen-zhuo Wang wei xie Hong-yi Yao Mu-feng Chen Tian-yan Zhang Zhuo-zheng Li 《Water Science and Engineering》 2025年第1期78-89,共12页
Accurate capture and presentation of the interactive feedback relationships among various objectives in multi-objective reservoir operation is essential for maximizing operational benefits.In this study,the niche theo... Accurate capture and presentation of the interactive feedback relationships among various objectives in multi-objective reservoir operation is essential for maximizing operational benefits.In this study,the niche theory of ecology was innovatively applied to the field of reservoir operation,and a novel state-relationship(S-R)measurement analysis method was developed for multi-objective reservoir operation.This method enables the study of interaction among multiple objectives.This method was used to investigate the relationship among the objectives of power generation,water supply,and ecological protection for cascade reservoir operation in the Wujiang River Basin in China.The results indicated that the ecological protection objective was the most competitive in acquiring and capturing resources like flow and water level,while the water supply objective was the weakest.Power generation competed most strongly with ecological protection and relatively weakly with water supply.These findings facilitate decision-making throughout the reservoir operation process in the region.The S-R method based on the niche theory is convenient,efficient,and intuitive,allowing for the quantification of feedback relationships among objectives without requiring the solution of the Pareto frontier of a multi-objective problem in advance.This method provides a novel and feasible idea for studying multi-objective interactions. 展开更多
关键词 NICHE Interaction relationship Reservoir operation Multi-objective optimization Wujiang river
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Adherence to dietary guidelines and nutritional awareness among a population of Chinese university students:comparative analysis across sex,ethnicity,and BMI groups
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作者 Da Pan Dilinigeer Nuerxiati +18 位作者 Chenxin Shi Xiaoran Meng Yang Suo Yong Zhang Yuanyuan Wang wei xie Min Huang Wen Xu Jawhar Mamatjan Adila Abuduwupur Yajie Zhou Yanli Gao Shiyun Wan Ligang Yang Baofu Guo Shaokang Wang Guiju Sun Hui Xia Di Jin 《Food Science and Human Wellness》 2025年第11期4682-4692,共11页
University students,transitioning from adolescence to adulthood,are at a critical stage where dietary habits and health behaviors are established,influencing long-term health outcomes.This study aimed to assess the di... University students,transitioning from adolescence to adulthood,are at a critical stage where dietary habits and health behaviors are established,influencing long-term health outcomes.This study aimed to assess the dietary intake and nutritional awareness of a population of Chinese university students(n=833),comparing their consumption with national dietary guidelines and reference intakes,while exploring subgroup differences.Results indicated that males had significantly higher amounts of most food categories compared to females.Except for whole grains and legumes,ethnic minorities had lower compliance with the recommended intakes for several food categories compared to Han Chinese.Han males consumed more energy,protein,and fat than their ethnic minority counterparts.Obese participants showed higher protein and fat intake compared to those with normal body mass index(BMI).Additionally,BMI-related trends in macronutrient contributions showed that protein and fat contributed more to the total energy intake of individuals with higher BMI.Han individuals also had higher energy contributions from protein and fat and lower carbohydrate contributions compared to ethnic minorities.Nutrient intake was generally below recommended levels,with low proportions of participants meeting the recommended intake for vitamin A,C,calcium and dietary fiber.High proportions of participants exceeded the tolerable upper intake levels for iron and manganese.Nutritional awareness scores were also significantly higher among Han students,as well as those with higher BMIs and higher income levels.This study highlights significant disparities in dietary intake and nutritional awareness among Chinese university students,with variations across sex,ethnicity,BMI,and income categories. 展开更多
关键词 Chinese university students Dietary intake Nutritional awareness Chinese Dietary Guidelines Dietary reference intakes(DRIs)
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Experimental and numerical study on double wedge shock/shock interaction controlled by a single-pulse plasma synthetic jet
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作者 wei xie Zhenbing LUO +3 位作者 Yan ZHOU Qiang LIU Xiong DENG Yinxin ZHU 《Plasma Science and Technology》 2025年第4期30-41,共12页
The phenomenon of shock/shock interaction(SSI)is widely observed in high-speed flow,and the double wedge SSI represents one of the typical problems encountered.The control effect of single-pulse plasma synthetic jet(P... The phenomenon of shock/shock interaction(SSI)is widely observed in high-speed flow,and the double wedge SSI represents one of the typical problems encountered.The control effect of single-pulse plasma synthetic jet(PSJ)on double wedge type-Ⅵand type-ⅤSSI was investigated experimentally and numerically,and the influence of discharge energy was also explored.The findings indicate that the interaction between PSJ and the high-speed freestream results in the formation of a plasma layer and a jet shock,which collectively governs the control of SSI.The control mechanism of single-pulse PSJ on SSI lies in its capacity to attenuate both shock and SSI.For type-ⅥSSI,the original second-wedge oblique shock is eliminated under the control of PSJ,resulting in a new type-ⅥSSI formed by the jet shock and the first-wedge oblique shock.For type-ⅤSSI,the presence of PSJ effectively mitigates the intensity of Mach stem,supersonic jet,and reflected shocks,thereby facilitating its transition into type-ⅥSSI.The numerical results indicate that the peak pressure can be reduced by approximately 32.26%at maximum.Furthermore,the development of PSJ also extends in the Z direction.The pressure decreases in the area affected by both PSJ and jet shock due to the attenuation of the SSI zone.With increasing discharge energy,the control effect of PSJ on SSI is gradually enhanced. 展开更多
关键词 plasma synthetic jet shock/shock interaction double wedge high-speed vehicle active flow control(Some figures may appear in colour only in the online journal)
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Understanding subway passenger alighting and boarding dynamics:Experiments and modelling
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作者 Chenrui Xuan Yuxin Li +3 位作者 Yu Wang Eric Wai Ming Lee Yi Ma wei xie 《Chinese Physics B》 2025年第6期648-665,共18页
Efficiency and safety are paramount concerns for commuters, operators, and designers in subway stations. This study conducted controlled experiments and developed a modified force-based model to investigate the dynami... Efficiency and safety are paramount concerns for commuters, operators, and designers in subway stations. This study conducted controlled experiments and developed a modified force-based model to investigate the dynamics of pedestrian counterflow at bottlenecks, utilizing subway passenger alighting and boarding as a case study. Specifically, the efficiency and safety of three distinct movement modes: the cooperative mode(Coop), the combination of cooperative and competitive mode(C & C), and the competitive mode(Comp), were examined and compared. The experimental findings revealed that the C & C mode exhibited a clear lane formation phenomenon and demonstrated a higher flow rate than the Comp and Coop modes. This observation suggests that a combination of cooperative and competitive behaviors among pedestrians can positively enhance traffic efficiency and safety during the alighting and boarding process. In contrast, pedestrians exhibited increased detouring in their paths and more fluctuating trajectories in the Comp mode. Additionally, a questionnaire survey assessing the level of competition and cooperation among pedestrians provided a comprehensive analysis of the psychological dynamics of passengers during the alighting and boarding activities. Lastly, the proposed force-based model was calibrated and validated, demonstrating a good performance in accurately replicating the overall characteristics of the experimental process. Overall, this study offers valuable insights into enhancing the pedestrian traffic efficiency and safety within subway systems. 展开更多
关键词 pedestrian dynamics travel behavior alighting and boarding subways force-based model
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Radiative Cooling Materials for Extreme Environmental Applications
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作者 Jianing Xu wei xie +7 位作者 Hexiang Han Chengyu Xiao Jing Li Yifan Zhang Shaowen Chen Binyuan Zhao Di Zhang Han Zhou 《Nano-Micro Letters》 2025年第12期633-678,共46页
Radiative cooling is a passive thermal management strategy that leverages the natural ability of materials to dissipate heat through infrared radiation.It has significant implications for energy efficiency,climate ada... Radiative cooling is a passive thermal management strategy that leverages the natural ability of materials to dissipate heat through infrared radiation.It has significant implications for energy efficiency,climate adaptation,and sustainable technology development,with applications in personal thermal management,building temperature regulation,and aerospace engineering.However,radiative cooling performance is susceptible to environmental aging and special environmental conditions,limiting its applicability in extreme environments.Herein,a critical review of extreme environmental radiative cooling is presented,focusing on enhancing environmental durability and cooling efficiency.This review first introduces the design principles of heat exchange channels,which are tailored based on the thermal flow equilibrium to optimize radiative cooling capacity in various extreme environments.Subsequently,recent advancements in radiative cooling materials and micronano structures that align with these principles are systematically discussed,with a focus on their implementation in terrestrial dwelling environments,terrestrial extreme environments,aeronautical environments,and space environments.Moreover,this review evaluates the cooling effects and anti-environmental abilities of extreme radiative cooling devices.Lastly,key challenges hindering the development of radiative cooling devices for extreme environmental applications are outlined,and potential strategies to overcome these limitations are proposed,aiming to prompt their future commercialization. 展开更多
关键词 Extreme environment Radiative cooling material Micro-nano structure Heat exchange channel Latent heat
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Fast prediction of high-speed missile flow field characteristics under transverse jet control based on deep learning
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作者 Zhenwei DING Zhenbing LUO +3 位作者 Qiang LIU Yan ZHOU wei xie Zhijie ZHAO 《Chinese Journal of Aeronautics》 2025年第8期154-168,共15页
The complex flow characteristics of transverse jet in high-speed crossflow involve several separation regions and multiple shock waves,which make it difficult to capture and precisely predict the flow field state in r... The complex flow characteristics of transverse jet in high-speed crossflow involve several separation regions and multiple shock waves,which make it difficult to capture and precisely predict the flow field state in real time merely by relying on traditional approaches.With the rapid advancement of deep learning technology,its powerful data processing capability offers a fast method for the prediction of the transverse jet flow field.Consequently,a prediction model based on deep learning is established,with the aim of obtaining the flow characteristics of a transverse jet under different freestream and jet conditions.This study segments the complex grid into several individual grids and trains them independently.The trained model can successfully establish the nonlinear mapping relationship between the transverse jet flow field and the input parameters.The prediction accuracy of the established model for the wall pressure under different conditions exceeds 99%,and the established model is also capable of reproducing structures such as shock waves and recirculation zones in the overall flow field,thereby achieving highly precise and efficient prediction of the jet structure and flow information.The results suggest that in contrast to the traditional numerical simulation,this deep learning model demonstrates greater efficiency in predicting the transverse jet flow field. 展开更多
关键词 Transverse jet in high-speed crossflow Flow field characteristics Deep learning Fast prediction
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High-sensitivity spectroscopic measurements under pulsed high magnetic field
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作者 Zheng Wang Yichun Pan +2 位作者 Guangran Yang wei xie weihang Zhou 《Chinese Physics B》 2025年第7期60-65,共6页
Pulsed magnet technology is the only way to generate ultra-strong magnetic fields higher than 45 T so far.However,the inherently fast-changing field strength(typically on the order of 1000 T/s)poses significant challe... Pulsed magnet technology is the only way to generate ultra-strong magnetic fields higher than 45 T so far.However,the inherently fast-changing field strength(typically on the order of 1000 T/s)poses significant challenges for spectroscopic measurements which rely on time integration of signals to improve spectral qualities.In this work,we report high-sensitivity spectroscopic measurements under pulsed high magnetic fields employing the long flat-top pulsed magnetic field technique.By means of a multiple-capacitor power supply,we were able to generate pulsed high magnetic fields with controllable flat-top pulse width and field stabilities.By synchronizing spectroscopic measurements with the waveform of the flattop magnetic field,the integration time of each spectrum can be increased by up to 100 times compared with that of the conventional spectroscopic measurements under pulsed magnetic fields,thus enabling high-sensitivity spectroscopic measurements under ultra-strong pulsed magnetic fields.These findings promise an efficient way to significantly improve the performance and extend the application of optical measurements under pulsed high magnetic fields. 展开更多
关键词 pulsed magnet flat-top pulsed magnetic field optical spectroscopy PHOTOLUMINESCENCE
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A mouse coccygeal intervertebral disc degeneration model with tail-looping constructed using a suturing method
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作者 wei xie Zemao Huang +9 位作者 Ziyang Huang Deqing Luo Zhangxin Chen Li xie Lingqi Zhu Hui Liu Kejian Lian Paolo Alberton Denitsa Docheva Dasheng Lin 《Animal Models and Experimental Medicine》 2025年第9期1645-1655,共11页
Backgroud:Intervertebral disc degeneration(IDD)is one of the common degenerative diseases.Due to ethical constraints,it is difficult to obtain sufficient research on humans,so the use of an animal model of IDD is very... Backgroud:Intervertebral disc degeneration(IDD)is one of the common degenerative diseases.Due to ethical constraints,it is difficult to obtain sufficient research on humans,so the use of an animal model of IDD is very important to clarify the pathogenesis and treatment mechanism of the disease.Methods:In this study,thirty 2-month-old mice were selected for operation to establish a coccygeal IDD model.The distal tail portion of the tail(beyond the 17th coccygeal vertebra)and a small piece of skin above the 8th coccygeal vertebra were excised,and the two incisions were brought together after flexion,and secured with sutures.The heights and signal intensities of the intervertebral discs(IVDs)were assessed using microcomputed tomography(μCT)and magnetic resonance imaging(MRI)at 0,6,12 weeks postoperatively.The overall tissue morphology,cell distribution and density,and extracellular matrix of the IVDs were also assessed using Hematoxylin and Eosin(HE),Safranin O-Fast Green and immunohistochemical staining.Results:All mice in the experimental group survived after the operation,and there were no complications such as wound infection,tail necrosis and suture shedding.The experimental results demonstrated that the suturing method can successfully initiate IDD.Different severity levels of IDD can be induced by controlling the bending angle of the IVDs within the tail loop;however,for consistency,histologic and imaging results should be obtained at the same bending angle and looping period.Conclusions:This IDD model is an effective method for studying the etiology and treatment of degenerative IVD disease. 展开更多
关键词 animal model intervertebral disc degeneration mechanical stress MICE
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Process mechanism research on direct vortex melting reduction of vanadium–titanium magnetite
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作者 Yong-chao Han Zhi-he Dou +2 位作者 Zhan-ning Yang wei xie Ting-an Zhang 《Journal of Iron and Steel Research International》 2025年第3期536-549,共14页
In response to the new mechanism of direct vortex melting reduction of vanadium–titanium magnetite,the reaction control mechanism and the migration regularity of valuable components in the process of direct melting r... In response to the new mechanism of direct vortex melting reduction of vanadium–titanium magnetite,the reaction control mechanism and the migration regularity of valuable components in the process of direct melting reduction were investigated using kinetic empirical equation by fitting and combining with X-ray diffraction,X-ray fluorescence,scanning electron microscopy,energy-dispersive spectrometry,and optical microscopy.The results show that iron reduction is controlled by the mass transfer process of(FeOx)in the slag,while vanadium reduction is controlled by both the mass transfer of(VOx)in the slag and the mass transfer of[V]in the molten iron,and the slag–metal interfacial reaction is the only pathway for vanadium reduction.The reduction of iron and vanadium is an obvious first-order reaction,with activation energy of 101.6051 and 197.416 kJ mol^(−1),respectively.Increasing the vortex rate and reaction temperature is beneficial to improving the reaction rate and reduction efficiency.The mineral phase variation of iron and vanadium in the slag during the reduction process is Fe_(2)O_(3)→Fe_(3)O_(4)/FeV_(2)O_(4)→FeTiO_(3) and FeV_(2)O_(4)→MgV_(2)O_(5);titanium in slag is mainly in the form of Mg_(x)Ti_(3−x)O_(5)(0≤x≤1)and CaTiO_(3).As the reaction time went on,the molar ratio(nTi/nMg)in Mg_(x)Ti_(3−x)O_(5)(0≤x≤1)and the Ti2O_(3) content in the slag gradually went up,while the area proportion of Mg_(x)Ti_(3−x)O_(5)(0≤x≤1)went up and then down,and the porosity of the slag and the grain size of Mg_(x)Ti_(3−x)O_(5)(0≤x≤1)got smaller. 展开更多
关键词 Vanadium-titanium magnetite Vortex melting reduction KINETICS Reduction process mechanism
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解析基因组如何编码脑的挑战 被引量:1
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作者 谢维 林承棋 +1 位作者 李健 李默怡 《遗传》 CAS CSCD 北大核心 2021年第5期393-396,共4页
人脑是自然界生物体内结构和功能最复杂的器官。解析人类基因组如何编码人脑的结构与功能是极具挑战的科学与技术问题,也是从根本上认识脑的本质问题。本文对近年来脑的“断面”组学研究的相关进展进行归纳,提出解析基因组如何编码脑的... 人脑是自然界生物体内结构和功能最复杂的器官。解析人类基因组如何编码人脑的结构与功能是极具挑战的科学与技术问题,也是从根本上认识脑的本质问题。本文对近年来脑的“断面”组学研究的相关进展进行归纳,提出解析基因组如何编码脑的挑战与展望。 展开更多
关键词 发育 基因组 编码 自闭症
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A Robust Alternative Virtual Key Input Scheme for Virtual Keyboard Systems
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作者 Prince Owusu-Agyeman wei xie Yao Yeboah 《Journal of Computer and Communications》 2016年第4期99-108,共10页
Towards virtual keyboard design and realization, the work in this paper presents a robust key input method for deployment in virtual keyboard systems. The proposed scheme harnesses the information contained within sha... Towards virtual keyboard design and realization, the work in this paper presents a robust key input method for deployment in virtual keyboard systems. The proposed scheme harnesses the information contained within shadows towards robustifying virtual key input. This scheme allows for input efficiency to be guaranteed in situations of relatively lower illumination, a core challenge associated with virtual keyboards. Contributions of the paper are two-fold. Firstly the paper pre-sents an approach towards effectively applying shadow information towards robustifying virtual key input systems;Secondly, through morphological operations, the performance of this input method is boosted by means of effectively alleviating noise and its impacts on overall algorithm performance, while highlighting the necessary features towards an efficient performance. While previous contributions have followed a similar trend, the contribution of this paper stresses on the intensification and improvement of both shadow and finger-tip feature highlighting schemes towards overall performance improvement. Experimental results presented in the paper demon-strate the efficiency and robustness of the approach. The attained results suggest that the scheme is capable of attaining high performances in terms of accuracy while being capable of addressing false touch situations. 展开更多
关键词 Virtual Input Shadow-Based Input Input Robustication Virtual Key Input
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镍铁层状双金属氢氧化物在不同pH电解液体系中的析氧反应 被引量:4
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作者 谢起贤 任丹 +7 位作者 柏力晨 格日乐 周雯慧 白璐 谢微 王军虎 Michael Gratzel 罗景山 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2023年第1期127-138,共12页
利用可再生电力驱动水分解提供了一种绿色和可持续的方式来生产氢气(H_(2)),而提高水分解效率的关键是开发高效的电催化剂.作为水分解反应的阴极,析氢反应(HER)仅需要两电子转移,目前的研究较为成熟.相比之下,析氧反应(OER)因涉及四个... 利用可再生电力驱动水分解提供了一种绿色和可持续的方式来生产氢气(H_(2)),而提高水分解效率的关键是开发高效的电催化剂.作为水分解反应的阴极,析氢反应(HER)仅需要两电子转移,目前的研究较为成熟.相比之下,析氧反应(OER)因涉及四个电子的转移,比HER过程更复杂.在众多析氧催化剂中,镍铁(NiFe)基电催化剂是碱性电解液体系中最佳的OER催化剂之一,然而其在中性及近中性体系中活性降低较多,从而限制了其在中性的海水电解及二氧化碳还原体系中的应用.目前,造成NiFe基催化剂在中性体系中性能较差的具体机制尚不清晰.文献报道,随着体系pH逐渐降低,NiFe基催化剂析氧性能也会随之变差;深入研究发现,碱性体系中更易于形成高价的Ni,Fe物质,但其是否对催化剂在水分解过程中有影响仍有待进一步研究.本文将电化学测试与原位光谱技术相结合,对镍铁层状双金属氢氧化物(NiFe LDH)在不同pH电解液体系中的析氧反应机理进行深入研究.电化学测试结果表明,随着pH值逐渐降低,NiFe LDH催化剂的析氧性能逐渐变差.原位表面增强拉曼光谱结果表明,不同pH电解液体系中NiOOH和“活性氧”物质的形成与施加的阳极电位有关,高价Ni物质在高pH电解液中更容易形成,而在中性及近中性体系中则需要较高的电位才可以形成.引入原位^(57)Fe穆斯堡尔谱以观察稳定阳极电位条件下Fe氧化态的变化,测试结果表明,高价的Fe^(4+)物质在碱性条件容易形成,而对于中性及近中性体系中,在高施加电位下仍旧难以形成Fe^(4+)物质.为探究高价态Ni,Fe是否影响NiFe基催化剂的析氧性能,利用电化学活化方法构筑了具有Ni^(3+)和Fe^(4+)物质的NiFe CVA_(500)(500圈CV循环)催化剂,保证其在不同的pH电解液体系中保持相同的初始反应状态.在对应pH体系中,电化学活化的NiFe CVA_(500)催化剂相较于原始的NiFe LDH性能有所提升,但在中性体系中的OER性能仍然低于碱性体系中的性能.基于电化学及原位光谱测量结果表明,Ni^(3+)和Fe^(4+)物质的形成并不是影响不同pH条件下OER性能的决定性因素.OER电化学性能、动力学研究和甲醇氧化实验结果发现,NiFe LDH在不同pH体系中的析氧反应决速步是不同的,在碱性电解液体系中,其决速步是从*O到*OOH,而中性体系中*OH的形成为决速步.综上,本文为阐明NiFe基催化剂在不同pH电解液体系中的OER反应机制提供了新的见解. 展开更多
关键词 镍铁层状双金属氢氧化物 析氧反应 原位表面增强拉曼光谱 原位57Fe穆斯堡尔光谱
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