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Revisit of GeV Gamma-Ray Emission from Orion B with the Fermi Large Area Telescope

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Research in Astronomy and Astrophysics 2024年第9期24卷 128-135页

作者： wei Zeng Xiao-Na Sun Rui-Zhi Yang Jia-Chun He Zhao-Dong Shi Ting-Ting Ge Yun-Feng liang En-wei liang Guangxi Key Laboratory for Relativistic Astrophysics School of Physics Science and TechnologyGuangxi UniversityNanning 530004China Department of Astronomy School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Key Labrotory for Research in Galaxies and Cosmology University of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China

We revisit the γ-ray emission above 300 Me V towards the massive star-forming region of Orion B by adopting14 yr observations with the Fermi Large Area Telescope and utilizing the updated software *** extended γ-ray emission region around Orion B is resolved into two components(region Ⅰ and region Ⅱ).The γ-ray spectrum of region I agrees with the predicted γ-ray spectrum assuming the cosmic ray(CR)density is the same as that of Alpha Magnetic Spectrometer(AMS-02)measured ***γ-ray emissivity of region II appears to be deficit at low energy band(E<3 GeV).Through modeling we find that CR densities exhibit a significant deficit below 20 Ge V,which may be caused by a slow diffusion inside the dense *** is probably caused by an increased magnetic field whose strength increases with the gas density.

关键词： (ISM:)cosmic rays gamma-rays:ISM (Galaxy:)open clusters and associations:individual(NGC 2023 NGC 2024 NGC 2068 and NGC 2071)

A low-melting-point metal doping strategy for the synthesis of small-sized intermetallic Pt_(5)Ce fuel cell catalysts

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Nano Research 2024年第9期17卷 8112-8118页

作者： Zi-Jun Zou Shi-Yi Yin Yao Tang Sheng-liang Zhong Lei Wang Shi-Long Xu Hai-wei liang College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China Department of Chemistry University of Science and Technology of ChinaHefei 230026China School of Materials and Chemical Engineering Anhui Jianzhu UniversityHefei 230601China

Carbon-supported platinum-lanthanum(Pt-Ln)intermetallic compound(IMC)nanoparticles with high activity and robust stability have been demonstrated as promising cathode catalysts for proton-exchange membrane fuel ***,the preparation of Pt-Ln IMC catalysts needs high-temperature annealing treatment that inevitably causes nanoparticle sintering,resulting in significant reduction of the electrochemical surface area and mass-based ***,we prepare small-sized M-doped Pt_(5)Ce(M=Ga,Cd,and Sb)IMCs catalysts via a low-melting-point metal doping *** speculate that the doping of low-melting-point metals can facilitate the generation of vacancies in the crystal lattice through thermal activation and thus reduce the kinetic barriers for the formation of intermetallic Pt_(5)Ce *** prepared Ga-doped Pt_(5)Ce catalyst exhibits a higher electrochemical active surface area(81 m^(2)·gPt^(-1))and a larger mass activity(0.45 A·mgPt^(-1)at 0.9 V)over the undoped Pt_(5)Ce and commercial Pt/C *** the membrane electrode assembly test,the Ga-doped Pt_(5)Ce cathode delivers a power density of 0.98 W·cm^(-2)at 0.67 V,along with a voltage loss of only 27 mV at 0.8 A·cm^(-2)at the end of accelerated stability test.

关键词： P5Ce low-melting-point metal small-sized intermetallic compound catalysis fuel cells

Perfluorooctane sulfonate promotes the migration of colorectal cancer cells by inducing epithelial-mesenchymal transition

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Journal of Environmental Sciences 2024年第11期145卷 1-12页

作者： Fangfang Li Lu Chen Bi-Xia Peng Yuyang Lei Minjie Li liang-hong Guo Institute of Environmental and Health Sciences China Jiliang UniversityHangzhou 310018China Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province Hangzhou 310015China College of Quality and Safety Engineering China Jiliang UniversityHangzhou 310018China College of Life Sciences China Jiliang UniversityHangzhou 310018China

The potential association between colorectal cancer(CRC)and environmental pollutants is *** studies have found that some perfluoroalkyl acids,including perfluorooctane sulfonate(PFOS),induced colorectal tumors in experimental animals and promoted the migration of and invasion by CRC cells in vitro,but the underlying mechanism is ***,we investigated the effects of PFOS on the proliferation and migration of CRC cells and the potentialmechanisms involving activating the PI3K/Akt-NF-κB signal pathway and epithelial-mesenchymal transition(EMT).It was found that PFOS promoted the growth andmigration of HCT116 cells at non-cytotoxic concentrations and increased the mRNA expression of the migration-related angiogenic cytokines vascular endothelial growth factor(VEGF)and interleukin-8(IL-8).In a mechanistic investigation,the up-stream signal pathway PI3K/Akt-NF-κB was activated by PFOS,and the process was suppressed by LY294002(PI3K/Akt inhibitor)and BAY11-7082(NF-κB inhibitor)respectively,leading to less proliferation of HCT116 ***,matrix metalloproteinases(MMP)and EMT-related markers were up-regulated after PFOS exposure,and were also suppressed respectively by LY294002 and ***,the up-regulation of EMT markers was suppressed by a MMP inhibitor *** together,our results indicated that PFOS promotes colorectal cancer cell migration and proliferation by activating the PI3K/Akt-NF-κB signal pathway and epithelial-mesenchymal *** could be a potential toxicological mechanism of PFOS-induced malignant development of colorectal cancer.

关键词： Perfluorooctane sulfonate Colorectal cancer Cell migration PI3K/Akt-NF-κB Epithelial-mesenchymal transition

Consensus-based Optimal Control Strategy for Multi-microgrid Systems with Battery Degradation Consideration

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 1911-1924页

作者： Tonghe Wang hong liang Bo He Haochen Hua Yuchao Qin Junwei Cao Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China Meihua Holdings Group Co. Ltd.Langfang 065001China. Department of Astronautical Science and Technology Space Engineering UniversityBeijing 101416China College of Energy and Electrical Engineering Hohai UniversityNanjing211100China Department of Applied Mathematics and Theoretical Physics University of CambridgeCambridgeCB30WAUK. Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China

Consensus has been widely used in distributed control,where distributed individuals need to share their states with their neighbors through communication links to achieve a common ***,the objectives of existing consensus-based control strategies for energy systems seldom address battery degradation cost,which is an important performance indicator to assess the performance and sustainability of battery energy storage(BES)*** this paper,we propose a consensusbased optimal control strategy for multi-microgrid systems,aiming at multiple control objectives including minimizing battery degradation *** consensus is used to synchronize the ratio of BES output power to BES state-of-charge(SoC)among all microgrids while each microgrid is trying to reach its individual *** order to reduce the pressure of communication links and prevent excessive exposure of local information,this ratio is the only state variable shared between *** our complex nonlinear problem might be difficult to solve by traditional methods,we design a compressive sensing-based gradient descent(CSGD)method to solve the control *** simulation results show that our control strategy results in a 74.24%reduction in battery degradation cost on average compared to the control method without considering battery *** addition,the compressive sensing method causes an 89.12%reduction in computation time cost compared to the traditional Monte Carlo(MC)method in solving the control problem.

关键词： Battery degradation compressive sensing consensus distributed control multi-microgrid

Effect of different anesthetic modalities with multimodal analgesia on postoperative pain level in colorectal tumor patients

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World Journal of Gastrointestinal Oncology 2024年第2期16卷 364-371页

作者： Ji-Chun Tang Jia-wei Ma Jin-Jin Jian Jie Shen liang-liang Cao Department of Anesthesiology The Affiliated Hospital of Jiangnan UniversityWuxi 214122Jiangsu ProvinceChina Department of Anesthesiology People's Hospital of Aheqi CountyKizilsu Kirgiz Autonomous Prefecture 843599Xinjiang Uygur Autonomous RegionChina Department of Critical Care Medicine Jiangnan University Medical CenterWuxi 214122Jiangsu ProvinceChina Department of Critical Care Medicine People's Hospital of Aheqi CountyKizilsu Kirgiz Autonomous Prefecture843599Xinjiang Uygur Autonomous RegionChina

BACKGROUND According to clinical data,a significant percentage of patients experience pain after surgery,highlighting the importance of alleviating postoperative *** current approach involves intravenous self-control analgesia,often utilizing opioid analgesics such as morphine,sufentanil,and *** for colo-rectal cancer typically involves general ***,optimizing anes-thetic management and postoperative analgesic programs can effectively reduce perioperative stress and enhance postoperative *** study aims to analyze the impact of different anesthesia modalities with multimodal analgesia on patients'postoperative *** To explore the effects of different anesthesia methods coupled with multi-mode analgesia on postoperative pain in patients with colorectal *** Following the inclusion criteria and exclusion criteria,a total of 126 patients with colorectal cancer admitted to our hospital from January 2020 to December 2022 were included,of which 63 received general anesthesia coupled with multi-mode labor pain and were set as the control group,and 63 received general anesthesia associated with epidural anesthesia coupled with multi-mode labor pain and were set as the research *** data collection,the effects of postoperative analgesia,sedation,and recovery were *** Compared to the control group,the research group had shorter recovery times for orientation,extubation,eye-opening,and spontaneous respiration(P<0.05).The research group also showed lower Visual analog scale scores at 24 h and 48 h,higher Ramany scores at 6 h and 12 h,and improved cognitive function at 24 h,48 h,and 72 h(P<0.05).Additionally,interleukin-6 and interleukin-10 levels were significantly reduced at various time points in the research group compared to the control group(P<0.05).Levels of CD3+,CD4+,and CD4+/CD8+were also lower in the research group at multiple time points(P<0.05).CONCLUSION For patients with colorectal cancer,g

关键词： Multimodal analgesia Anesthesia Colorectal cancer Postoperative pain

Engineering a high-barrier d-f single-molecule magnet centered with hexagonal bipyramidal Dy(Ⅲ)unit

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Science China Chemistry 2024年第10期67卷 3291-3298页

作者： wei Deng Chan-Ying Yao Yan-Cong Chen Ying-Qian Zhou Shan-Nan Du Jun-liang Liu Ming-liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistryInstitute of Green Chemistry and Molecular EngineeringGuangdong Basic Research Center of Excellence for Functional Molecular EngineeringSun Yat-sen UniversityGuangzhou 510006China

In the pursuit of high-performance single-molecule magnets(SMMs),incorporating intramolecular magnetic coupling emerges as a pivotal *** these,d-f SMMs have garnered significant attention due to their remarkable versatility,which lies in their ability to tune coordination environments and facilely substitute metal ***,achieving performance-centric d-f SMMs through the synergistic interplay between highly anisotropic f ions and d-f magnetic interactions remains a formidable *** mononuclear hexagonal bipyramidal(D_(6h))Dy^(Ⅲ)SMMs have been successfully isolated,the exploration of d-f SMMs featuring D_(6h)-lanthanide metal centers remains uncharted *** this study,we employed planar bipodal ligands in conjunction with“staple-like”axial phenoxide ligands to synthesize the first hexagonal bipyramidal d-f ***,this compound exhibits alternating-current magnetic susceptibilities peaking up to 68 K with an energy barrier surpassing 1,200 K,thus establishing a new benchmark within the heterometallic d-f SMM landscape inclusive of complexes with diamagnetic d metals and paramagnetic f ***,the ferromagnetic interaction at the d-f sites engenders oscillating relaxation times contingent on the magnetic field—a characteristic distinct from mononuclear *** findings shed light on a deliberate design approach for d-f SMMs,emphasizing the cooperative utilization of high-barrier lanthanide modules alongside d ions through magnetic *** synergy significantly enhances and diversifies the magnetic dynamics of these intriguing molecular systems.

关键词： single-molecule magnets magnetic coupling crystal engineering hexagonal bipyramid energy barrier

Electrospun PCL/gelatin/arbutin nanofiber membranes as potent reactive oxygen species scavengers to accelerate cutaneous wound healing

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Regenerative Biomaterials 2024年第3期3卷 43-55页

作者： Mindong Du Shuhan Liu Nihan Lan Ruiming liang Shengde liang Maoqiang Lan Disen Feng Li Zheng Qingjun wei Ke Ma Department of Orthopaedics Trauma and Hand Surgery The First Affliated Hospital of Guangxi Medical UniversityGuangxi Medical UniversityNanning 530521China Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration The First Affliated Hospital of Guangxi Medical UniversityGuangxi Medicar UniversityNanning530021China Guangxi Collaborative Innovation Center for Biomedicine The First Affliated Hospital of Guangxi Medical UniversityGuangxi Medical UniversityNanning 530021China Department of Plastic&Cosmetic Surgery.The First Affliated Hospital of Guangxi Medical University Guangxi Medical UniversityNanning 530021China Pharmaceutical College Guangxi Medical UniversityNanning530021China

The presence of excessive reactive oxygen species(Ros)at a skin wound site is an important factor affecting wound *** scavenging,which regulates the ROS microenvironment,is essential for wound *** this study,we used novel electrospun PCL/gelatin/arbutin(PCL/G/A)nanofibrous membranes as wound dressings,with PCL/gelatin(PCL/G)as the backbone,and plantderived arbutin(hydroquinone-β-D-glucopyranoside,ARB)as an effective antioxidant that scavenges ROos and inhibits bacterial infection in *** loading of ARB increased the mechanical strength of the nanofibres,with a water vapour transmission rate of more than 2500g/(m^(2)×24h),and the water contact angle decreased,indicating that hydrophilicity and air permeability were significantly *** release and degradation experiments showed that the nanofibre membrane controlled the drug release and exhibited favourable *** experiments showed that the PCL/G/A nanofibre membranes were biocompatible,and DPPH and ABTS+radical scavenging experiments indicated that PCL/G/A could effectively scavenge ROS to reflect the antioxidant *** addition,haemostasis experiments showed that PCL/G/A had good haemostatic effects in vitro and in *** vivo animal wound closure and histological staining experiments demonstrated that PCL/G/A increased collagen deposition and remodelled epithelial tissue regeneration while showing good in vivo biocompatibility and *** conclusion,we successfully prepared a multifunctional wound dressing,PCL/G/A,for skin wound healing and investigated its potential role in wound healing,which is beneficial for the clinical translational application of phytomedicines.

关键词： arbutin nanofiber membranes wound dressing reactive oxygen species

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等离子涂层涡轮导向叶片热疲劳寿命预测研究

航空动力学报 2008年第1期23卷 1-8页

作者：魏洪亮杨晓光齐红宇北京航空航天大学能源与动力工程学院北京100083

针对等离子涂层涡轮导向叶片材料的变形特点,引入了粘塑性本构模型.进行了涂层高温氧化实验、带涂层构件热疲劳实验及有限元模拟研究.基于研究结果,建立了可以体现氧化损伤与热疲劳损伤耦合效应的寿命预测模型.计算分析了带涂层涡轮导... 详细信息

针对等离子涂层涡轮导向叶片材料的变形特点,引入了粘塑性本构模型.进行了涂层高温氧化实验、带涂层构件热疲劳实验及有限元模拟研究.基于研究结果,建立了可以体现氧化损伤与热疲劳损伤耦合效应的寿命预测模型.计算分析了带涂层涡轮导向叶片的稳态温度场、涂层隔热效果和基于宏观尺度的应力应变场,研究了宏、细观有限元计算结果间的转换关系,提出了等效系数的方法,对涡轮导向叶片表面涂层的热疲劳寿命进行了预测.寿命预测结果合理,方法可行.

关键词：航空航天推进系统等离子热障涂层涡轮导向叶片粘塑性本构方程热疲劳寿命预测

Robust polarimetric dehazing algorithm based on low-rank approximation and multiple virtual-exposure fusion

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Photonics Research 2024年第8期12卷 1640-1653页

作者： YIFU ZHOU HANYUE wei JIAN liang FEIYA MA RUI YANG LIYONG REN XUELONG LI School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710119China Xi’an Key Laboratory of Optical Information Manipulation and Augmentation(OMA) Xi’an 710119China Robust(Xixian New Area)Opto-Electro Technologies Co. Ltd.Xi’an 712000China Institute of Artificial Intelligence(TeleAI) China Telecom Corp Ltd.Beijing 100033China

Polarimetric dehazing is an effective way to enhance the quality of images captured in foggy ***,images of essential polarization parameters are vulnerable to noise,and the brightness of dehazed images is usually unstable due to different environmental *** two weaknesses reveal that current polarimetric dehazing algorithms are not robust enough to deal with different *** paper proposes a novel,to our knowledge,and robust polarimetric dehazing algorithm to enhance the quality of hazy images,where a low-rank approximation method is used to obtain low-noise polarization parameter ***,in order to improve the brightness stability of the dehazed image and thus keep the image have more details within the standard dynamic range,this study proposes a multiple virtual-exposure fusion(MVEF)scheme to process the dehazed image(usually having a high dynamic range)obtained through polarimetric *** experiments show that the proposed dehazing algorithm is robust and effective,which can significantly improve overall quality of hazy images captured under different environments.

关键词： algorithm approximation image