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Outage Analysis of Optimal UAV Cooperation with IRS via Energy Harvesting Enhancement Assisted Computational Offloading

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Computer Modeling in engineering & Sciences 2024年第2期138卷 1885-1905页

作者： Baofeng Ji Ying Wang Weixing Wang Shahid Mumtaz Charalampos Tsimenidis School of Information engineering Henan University of Science and TechnologyLuoyang471000China Research and Innovation center of Intelligent System Longmen LaboratoryLuoyang471000China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System(CEMEE) Luoyang471000China Sustainable Digital Communications and Energy Systems(DIGCOM)Group Nottingham Trent UniversityNottinghamUK

The utilization of mobile edge computing(MEC)for unmanned aerial vehicle(UAV)communication presents a viable solution for achieving high reliability and low latency *** study explores the potential of employing intelligent reflective surfaces(IRS)andUAVs as relay nodes to efficiently offload user computing tasks to theMEC server system ***,the user node accesses the primary user spectrum,while adhering to the constraint of satisfying the primary user peak interference ***,the UAV acquires energy without interrupting the primary user’s regular communication by employing two energy harvesting schemes,namely time switching(TS)and power splitting(PS).The selection of the optimal UAV is based on the maximization of the instantaneous signal-to-noise ***,the analytical expression for the outage probability of the system in Rayleigh channels is derived and *** study investigates the impact of various system parameters,including the number of UAVs,peak interference power,TS,and PS factors,on the system’s outage performance through *** proposed system is also compared to two conventional benchmark schemes:the optimal UAV link transmission and the IRS link *** simulation results validate the theoretical derivation and demonstrate the superiority of the proposed scheme over the benchmark schemes.

关键词： Unmanned aerial vehicle(UAV) intelligent reflective surface(IRS) energy harvesting computational offloading outage probability

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Virtual source approach for maximizing resolution in high-penetration gamma-ray imaging

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Matter and Radiation at Extremes 2024年第3期9卷 19-30页

作者： Yuchi Wu Shaoyi Wang Bin Zhu Yonghong Yan Minghai Yu Gang Li Xiaohui Zhang Yue Yang Fang Tan Feng Lu Bi Bi Xiaoqin Mao Zhonghai Wang Zongqing Zhao Jingqin Su Weimin Zhou Yuqiu Gu National Key Laboratory of Plasma Physics Laser Fusion Research CenterCAEPMianyangSichuan 621900China College of Physics Sichuan UniversityChengdu 610065China

High-energy gamma-ray radiography has exceptional penetration ability and has become an indispensable nondestructive testing(NDT)tool in various *** high-energy photons,point projection radiography is almost the only feasible imaging method,and its spatial resolution is primarily constrained by the size of the gamma-ray *** conventional industrial applications,gamma-ray sources are commonly based on electron beams driven by accelerators,utilizing the process of bremsstrahlung *** size of the gamma-ray source is dependent on the dimensional characteristics of the electron *** research has been conducted on various advanced accelerator technologies that have the potential to greatly improve spatial resolution in *** our investigation of laser-driven gamma-ray sources,a spatial resolution of about 90μm is achieved when the areal density of the penetrated object is 120 g/cm^(2).A virtual source approach is proposed to optimize the size of the gamma-ray source used for imaging,with the aim of maximizing spatial *** this virtual source approach,the gamma ray can be considered as being emitted from a virtual source within the convertor,where the equivalent gamma-ray source size in imaging is much smaller than the actual emission *** the basis of Monte Carlo simulations,we derive a set of evaluation formulas for virtual source scale and gamma-ray emission *** optimal conditions,the virtual source size can be as small as 15μm,which can significantly improve the spatial resolution of high-penetration imaging to less than 50μm.

关键词： resolution approach utilizing

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Generative pretrained transformer 4:an innovative approach to facilitate value-based healthcare

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Intelligent Medicine 2024年第1期4卷 10-15页

作者： Han Lyu Zhixiang Wang Jia Li Jing Sun Xinghao Wang Pengling Ren Linkun Cai Zhenchang Wang Max Wintermark Department of Radiology Capital Medical University Affiliated Beijing Friendship HospitalBeijing 100050China Department of Medical Imaging Capital Medical University Affiliated Beijing Friendship HospitalBeijing 100050China School of Biological Science and Medical engineering Beihang UniversityBeijing 100191China Department of Neuroradiology University of Texas MD Anderson CenterHoustonTX 77030USA

Objective Appropriate medical imaging is important for value-based *** aim to evaluate the performance of generative pretrained transformer 4(GPT-4),an innovative natural language processing model,providing appropriate medical imaging automatically in different clinical *** Institutional Review Boards(IRB)approval was not required due to the use of nonidentifiable ***,we used 112 questions from the American College of Radiology(ACR)Radiology-TEACHES Program as prompts,which is an open-sourced question and answer program to guide appropriate medical *** included 69 free-text case vignettes and 43 simplified *** the performance evaluation of GPT-4 and GPT-3.5,we considered the recommendations of ACR guidelines as the gold standard,and then three radiologists analyzed the consistency of the responses from the GPT models with those of the *** set a five-score criterion for the evaluation of the consistency.A paired t-test was applied to assess the statistical significance of the *** For the performance of the GPT models in free-text case vignettes,the accuracy of GPT-4 was 92.9%,whereas the accuracy of GPT-3.5 was just 78.3%.GPT-4 can provide more appropriate suggestions to reduce the overutilization of medical imaging than GPT-3.5(t=3.429,P=0.001).For the performance of the GPT models in simplified scenarios,the accuracy of GPT-4 and GPT-3.5 was 66.5%and 60.0%,*** differences were not statistically significant(t=1.858,P=0.070).GPT-4 was characterized by longer reaction times(27.1 s in average)and extensive responses(137.1 words on average)than *** As an advanced tool for improving value-based healthcare in clinics,GPT-4 may guide appropriate medical imaging accurately and efficiently。

关键词： Generative pretrained transformer 4 model Natural language processing Medical imaging Appropriateness

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在水相中通过手性配体直接合成手性魔幻尺寸团簇（英文）

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Science China Materials 2024年

作者：阮巧慧崔艳羽林倬汉张雪张欣李艳马骧 Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research center Frontiers Science Center for Mate-riobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology

尺寸小于2 nm的手性胶体半导体魔尺寸团簇(MSCs)为手性配体提供了丰富的表面结合位点,因此在手性半导体纳米材料应用方面具有巨大潜力.然而,手性MSCs的制备和光学表征却鲜有报道.本研究以手性半胱氨酸为配体,首次在室温水溶液中合成了...

尺寸小于2 nm的手性胶体半导体魔尺寸团簇(MSCs)为手性配体提供了丰富的表面结合位点,因此在手性半导体纳米材料应用方面具有巨大潜力.然而,手性MSCs的制备和光学表征却鲜有报道.本研究以手性半胱氨酸为配体,首次在室温水溶液中合成了单组合形式的手性MSCs,其中CdS MSCs在366 nm波长处有独特的尖锐吸收峰, CdSe MSCs在420 nm波长处有独特的尖锐吸收峰.通过改变手性配体的添加量,可以很容易地调节所制备的手性MSCs的光学活性.制备的手性CdS M S C s和C d S e M S C s的最大吸收不对称系数分别达到3.6×1 0-4和5.6×10-4.实验结果表明,制备的MSCs的手性光学特性可能来源于配体诱导MSCs表面的原子重排.本研究不仅提供了制备手性MSCs的方法,而且为手性MSCs的研究和应用开辟了道路.

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Graphdiyne scaffold anchored highly dispersed ruthenium nanoparticles as an efficient cathode catalyst for rechargeable Li-CO_(2) battery

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Chinese Chemical Letters 2024年第1期35卷 552-557页

作者： Yiru Ma Huiqi Qu Wenna Wang Ziyang Guo Yueqin Yu Feng Liu Bin Yu Minge Tian Zhenjiang Li Bin Li Lei Wang College of Chemistry and Molecular engineering State Key Laboratory Base of Eco-Chemical EngineeringInternational Science and Technology Cooperation Base of Eco-Chemical Engineering and Green ManufacturingQingdao University of Science and TechnologyQingdao 266042China College of Materials Science and engineering Qingdao University of Science and TechnologyQingdao 266042China College of Environment and Safety engineering Qingdao University of Science and TechnologyQingdao 266042China College of Chemical engineering Qingdao University of Science and TechnologyQingdao 266042China Biomedical Sensing engineering Technology Research center Shandong UniversityJi'nan 250100China Scientific Green(Shandong)Environmental Technology Co. Ltd.Jining Economic Development ZoneJining 272499China

Lithium (Li)-CO_(2) battery is rising as an attractive energy-storage system with the competence of CO_(2) conversion/fixation. However, its practical development is seriously hindered by the high overpotential. Herein, a rational design on a highly catalytic Li-CO_(2) battery electrode built by graphdiyne powder as a multi-functional laminar scaffold with anchored highly dispersed Ru nanoparticles is explored. The strong interaction between the abundant acetylenic bond sites of graphdiyne scaffold and Ru nanoparticles can effectively promote the electrochemical progress and reduce the voltage polarization. The unique channels architecture of the cathodic catalyst with enough space not only accelerates CO_(2) diffusion and electrons/Li+ transport, but also allows a large amount of accommodation for discharged product (Li2CO3) to assure an advanced capacity. The corresponding Li-CO_(2) battery displays an advanced discharged capacity of 15,030 mAh/g at 500 mA/g, great capacity retention of 8873 mAh/g at 2 A/g, high coulombic efficiency of 97.6% at 500 mA/g and superior life span for 120 cycles with voltage gap of 1.67 V under a restricted capacity of 1000 mAh/g at 500 mA/g. Ex/in-situ studies prove that synergy between Ru nanoparticles and acetylene bonds of GDY can boost the round-trip CO_(2)RR and CO_(2)ER kinetics.

关键词： Nanopores Li-CO_(2)battery Anchored Ru nanoparticles Graphdiyne Synergistic effect

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采用改进的元胞自动机方法对三元Al-Si-Mg合金凝固微观组织进行数值模拟（英文）

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Science China Materials 2024年

作者：谭云骧赵海东许庆彦 Key Laboratory for Advanced Materials processing Technology Ministry of Education School of Materials Science and Engineering Tsinghua University National engineering Research center of Near-Net-Shape for Metallic Materials South China University of Technology

铝硅合金具有轻量化、高强度和易成形等独特优点.这些特性使得在低压压铸下能够生产大型、薄壁、复杂的铸件,这对于车辆轻量化至关重要.然而,这些合金的铸造过程容易产生缺陷,它们的性能与微观结构密切相关.认识到工艺、结构和性能之间...

铝硅合金具有轻量化、高强度和易成形等独特优点.这些特性使得在低压压铸下能够生产大型、薄壁、复杂的铸件,这对于车辆轻量化至关重要.然而,这些合金的铸造过程容易产生缺陷,它们的性能与微观结构密切相关.认识到工艺、结构和性能之间的深层联系具有巨大的学术和工程价值.在本工作中,我们通过整合热力学、动力学和多元相图数据库,建立了一个改进的元胞自动机(ICA)模型.基于在阶梯铸件不同位置的冷却曲线和凝固组织,我们建立了适用于Al-7Six Mg合金低压铸造的等轴晶形核模型.随后对该合金进行了低压铸造实验,微观结构演变的3D模拟结果与实验观察相吻合.我们进行了阶梯件低压铸造的实验, ICA模型准确地描绘了α-Al树枝晶,以及冷却速率对三元Al-7Si-x Mg合金中晶核密度和树枝晶尺寸均匀性的影响.我们的模拟结果与实验数据表现出显著的一致性.此外,我们对SDAS与冷却速率之间的关系进行了全面分析.通过将ICA模型与LGK分析模型进行对比,验证了在评估树枝晶生长速率时ICA模型的精确性.这项工作为集成计算材料工程建立凝固-组织-性能的定量关系提供了理论指导.

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A Methodology for Assessing Axial Compressor Stability with Inlet Temperature Ramp Distortion

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Journal of Thermal Science 2024年第3期33卷 856-871页

作者： SUN Dakun GU Benhao NING Fangfei FANG Yibo DONG Xu XU Dengke SUN Xiaofeng School of Energy and Power engineering Beihang UniversityBeijing102206China Research Institute of Aero-engine Beihang UniversityBeijing102206China

Based on a small perturbation stability model for periodic flow,the effects of inlet total temperature ramp distortion on the axial compressor are investigated and the compressor stability is quantitatively *** the beginning,a small perturbation stability model for the periodic flow in compressors is proposed,referring to the governing equations of the Harmonic Balance *** stability model is validated on a single-stage low-speed compressor TA36 with uniform inlet ***,the unsteady flow of TA36 with different inlet total temperature ramps and constant back pressure is simulated based on the Harmonic Balance *** on these simulations,the compressor stability is analyzed using the proposed small perturbation ***,the Dynamic Mode Decomposition method is employed to accurately extract pressure *** two parameters of the temperature ramp,ramp rate and Strouhal number,are discussed in this *** results indicate the occurrence and extension of hysteresis loops in the rows,and a decrease in compressor stability with increasing ramp *** performance is divided into two phases,stable and limit,based on the ramp ***,the model predictions suggest that a decrease in period length and an increase in Strouhal number lead to improved compressor *** DMD results imply that for compressors with inlet temperature ramp distortion,the increase of high-order modes and oscillations at the rotor tip is always the signal of decreasing stability.

关键词： axial compressor stability small perturbation model inlet temperature ramp distortion harmonic balance method dynamic mode decomposition method

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利用温度梯度法探究碳点的发光起源和形成机制（英文）

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Science China Materials 2024年

作者：杨艳婷张跃兴程有许鑫茹韩晶陈子欣汪航行 College of Chemistry and Chemical engineering Key Laboratory for the Synthesis and Application of Organic Functional Molecules (MOE)Hubei University Shandong Universities engineering Research center of Integrated Circuits Functional Materials and Expanded Applications Dezhou University

碳点(CDs)是一种新型荧光纳米材料,但人们对于CDs的荧光来源的理解相对滞后于其广泛的应用.揭示CDs发光机理的关键在于对其结构进行精确评估.本文利用温度梯度策略控制自下而上法CDs的形成过程,通过对反应中间体进行精确的结构表征,建...

碳点(CDs)是一种新型荧光纳米材料,但人们对于CDs的荧光来源的理解相对滞后于其广泛的应用.揭示CDs发光机理的关键在于对其结构进行精确评估.本文利用温度梯度策略控制自下而上法CDs的形成过程,通过对反应中间体进行精确的结构表征,建立明确的化学结构-荧光性质关系,类似于利用多米诺反应将小有机分子转化成复杂的天然产物.本文以二元组分柠檬酸和间二甲氨基苯酚生成的红色荧光CDs为例,通过逆合成分析,结合光谱表征和热力学计算,对该CDs的双波长发射的荧光来源,尤其是独特的激发波长依赖性的荧光发射特性进行了充分地阐述.该研究表明,温度梯度策略在探索CDs的结构-性能关系方面潜力巨大,十分有利于指导特定功能CDs的合理设计.

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Tomato CYP94C1 inactivates bioactive JA-lle to attenuate jasmonate-mediated defense during fruit ripening

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Molecular Plant 2024年第4期17卷 509-512页

作者： Tianxia Yang Lei Deng Qinyang Wang Chuanlong Sun Muhammad Ali Fangming Wu Huawei Zhaj Qian Xu Peiyong Xin Shujing Cheng Jinfang Chu Tingting Huang Chang-Bao Li Chuanyou Li Key Laboratory of Seed Innovation Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China College of Life Sciences Shandong Agricultural UniversityTai'an 271018China Taishan Academy of Tomato Innovation Tai'an 271018China CAS center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing 100049China College of Horticulture Science and engineering Shandong Agricultural UniversityTaian 271018China Institute of Vegetable Qingdao Academy of Agricultural SciencesQingdao 266100China Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(North China) Ministry of AgricultureBeijing Vegetable Research CenterBeijing Academy of Agriculture and Forestry SciencesBejing 100097China Frontiers Science center for Molecular Design Breeding(MOE) Department of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China

Dear Editor,Fruit rot caused by necrotrophic pathogens results in substantial reductions in fruit yield and revenues worldwide(Petrasch et al.,2019).A widespread phenomenon in fleshy fruit species is the susceptibility of ripe fruits to necrotrophs(Silva et al.,2021),which facilitates seed dispersal(Forlani et al.,2019)but causes severe post-harvest losses in *** most of the nutritional and sensory qualities of fruits are elaborated at the ripening stage(Liu et al.,2015),balancing fruit ripening and pathogen resistance to maintain fruit quality has proven to be challenging.A deeper understanding of the mechanisms underlying the increased susceptibility of fruits to necrotrophs during ripening could lead to new strategies for producing necrotrophy-resistant fruits without compromising ripening-relatedquality.

关键词： susceptibility maintain fruit

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Dosimetric risk factors for radiation esophagitis in patients with breast cancer following regional nodal radiation

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World Journal of Clinical Cases 2024年第17期12卷 2995-3003页

作者： Mei-Chen Ji Zhi-Jia Li Ke Li Yun-Xiao Wang Bo Yang Lin-Lin Lv Ying Su Zhi-Wei Zhang Zhong-Chao Huo Qing Qi Yong-Chang Lu Zhi-Qiang Cui Yan-Bao Liu Oncology center The Affiliated Hospital of Hebei University of EngineeringHandan 056002Hebei ProvinceChina General Surgery Department Handan First HospitalHandan 056002Hebei ProvinceChina Department of Breast Surgery The Affiliated Hospital of Hebei University of EngineeringHandan 056002Hebei ProvinceChina School of Clinical Medicine Hebei University of EngineeringHandan 056002Hebei ProvinceChina

BACKGROUND Radiation esophagitis(RE)is one of the most common clinical symptoms of regional lymph node radiotherapy for breast ***,there are fewer studies focusing on RE caused by hypofractionated radiotherapy(HFRT).AIM To analyze the clinical and dosimetric factors that contribute to the development of RE in patients with breast cancer treated with HFRT of regional lymph *** Between January and December 2022,we retrospectively analysed 64 patients with breast cancer who met our inclusion criteria underwent regional nodal intensity-modulated radiotherapy at a radiotherapy dose of 43.5 Gy/*** Of the 64 patients in this study,24(37.5%)did not develop RE,29(45.3%)developed grade 1 RE(G1RE),11(17.2%)developed grade 2 RE(G2RE),and none developed grade 3 RE or *** univariable logistic regression analysis found G2RE to be significantly correlated with the maximum dose,mean dose,relative volume 20-40,and absolute volume(AV)*** stepwise linear regression analyses found AV30 and AV35 to be significantly associated with G2RE(P<0.001).The optimal threshold for AV30 was 2.39 mL[area under the curve(AUC):0.996;sensitivity:90.9%;specificity:91.1%].The optimal threshold for AV35 was 0.71 mL(AUC:0.932;sensitivity:90.9%;specificity:83.9%).CONCLUSION AV30 and AV35 were significantly associated with *** thresholds for AV30 and AV35 should be limited to 2.39 mL and 0.71 mL,respectively.

关键词： Breast cancer Dosimetric parameters Radiation esophagitis Esophagitis Hypofractionated radiotherapy

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