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急性缺血性脑卒中CT生成MRI算法——基于影像组学的边缘感知扩散GAN

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计算机技术与发展 2024年第3期34卷 170-176页

作者：张美美秦品乐柴锐曾建潮翟双姣中北大学计算机科学与技术学院山西太原030051

相较于CT,急性缺血性脑卒中病灶在MRI上可清晰显示。鉴于患者中存在一些不适用于MRI检查的情况,如体内金属或幽闭恐惧症等,容易耽误患者病情。通过结合影像组学和扩散生成对抗网络(DiffusionGAN),该文提出了基于影像组学的边缘感知扩散G... 详细信息

相较于CT,急性缺血性脑卒中病灶在MRI上可清晰显示。鉴于患者中存在一些不适用于MRI检查的情况,如体内金属或幽闭恐惧症等,容易耽误患者病情。通过结合影像组学和扩散生成对抗网络(DiffusionGAN),该文提出了基于影像组学的边缘感知扩散GAN,实现了急性缺血性脑卒中患者的CT生成MRI。该算法弥补了现有CT生成MRI中病灶信息不足和边缘模糊的问题。具体而言,通过在CT上应用影像组学定位病灶,借助特征图辅助MRI生成,并提出边缘感知扩散GAN以提升生成MRI的边缘感知。实验证实,生成的MRI在峰值信噪比(PSNR)方面达到69.607,结构相似性(SSIM)为0.821,皮尔逊相关系数(PCC)为0.974,显著优于现有模型。医生评估显示生成的MRI不存在错误病灶,阳性/阴性分类准确度高达87.91%,表明这一创新性算法为解决在MRI不适用的特殊情况下的脑卒中诊断问题提供了新的途径。

关键词：医学图像生成计算机断层扫描(CT) 核磁共振成像(MRI) 急性缺血性脑卒中 DiffusionGAN 影像组学

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旱区陆面非降水性水分研究进展和展望

干旱气象 2024年第1期42卷 1-10页

作者：王胜张强张良王兴杜昊霖曾剑问晓梅中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室中国气象局干旱气候变化与减灾重点实验室甘肃兰州730020 兰州区域气候中心甘肃兰州730020 成都信息工程大学四川成都610225 上海市气象局上海201901

随着全球气候变暖,自然生态系统和水资源压力不断增加,加剧了全球水资源的短缺。旱区非降水性水分(Non-precipitation Water,NPW),作为一种重要的水源,对旱区生态系统和陆面水分平衡具有显著影响。本文基于国内外非降水性水分研究现状,... 详细信息

随着全球气候变暖,自然生态系统和水资源压力不断增加,加剧了全球水资源的短缺。旱区非降水性水分(Non-precipitation Water,NPW),作为一种重要的水源,对旱区生态系统和陆面水分平衡具有显著影响。本文基于国内外非降水性水分研究现状,总结其在西北旱区的观测方法、变化特征、形成机制及对陆面水分平衡和作物的影响。在结合非降水性水分研究国际趋势的基础上,指出当前研究的不足和问题,以及未来研究的重点方向:揭示陆面非降水性水分的复杂形成机制,加强对不同气候区和下垫面非降水性水分的认知,建立专门的陆面非降水性水分观测系统,发展其在数值模式中的参数化,以及制定陆面非降水性水分开发利用的技术标准。

关键词：旱区(干旱半干旱区) 非降水性水分露水土壤吸附水陆面水分平衡

Molecular Framework for Auxin-Controlled Hlomeostasis-of Shoot Stem Cells in Arabidopsis

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Molecular Plant 2018年第7期11卷 899-913页

作者： Linjie Luo jian zengg Haijun Wu Zhaoxia Tian Zhong Zhao CAS Center for Excellence in Molecular Plant Sciences School of Life Sciences University of Science and Technology of China Huangshan Road 443Hefei 230027 China

The classic phytohormone auxin plays an essential role in priming meristematic cell differentiation in the shoot apical meristem to promote lateral organ initiation. Recently, several lines of evidence have suggested that auxin is not only transported to new primordia but also descends to the stem cells in the central zone. However, the function of auxin in stem cell regulation has remained elusive. Here, we show that auxin signaling in stem cells is mediated, at least in part, byAUXIN RESPONSE FACTOR 5/MONOPTEROS （ARF5/MP）, which directly represses the transcription of DORNROSCHEN /ENHANCER OF SHO0 T REGENERA TION 1 （DRN/ESR 1）. DRN expressed in stem cells positively regulates CLAVATA3 （CLV3） expression and has important meristematic functions. Our results provide a mechanistic framework for auxin control of shoot stem cell homeostasis and demonstrate how auxin differentially controls plant stem cell maintenance and differentiation.

关键词： stem cell homeostasis auxin MONOPTEROS DORNROSCHEN

基于景观类型及其生态风险评价的巢湖流域生态安全格局优化建议

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华南地质 2024年第3期40卷 548-558页

作者：李月彭博林韶恺李洋周盈曾剑威江苏省地质调查研究院江苏南京210018 中国地质调查局南京地质调查中心江苏南京210016 福建理工大学土木工程学院福建福州350118

科学合理地构建生态安全格局是维护区域可持续发展的重要保障。为优化巢湖流域生态安全格局分区,本文以该流域2010年、2016年、2022年3期景观类型遥感数据为基础,通过景观风险评价模型,研究巢湖流域近年来景观生态风险的时空变化,并结... 详细信息

科学合理地构建生态安全格局是维护区域可持续发展的重要保障。为优化巢湖流域生态安全格局分区,本文以该流域2010年、2016年、2022年3期景观类型遥感数据为基础,通过景观风险评价模型,研究巢湖流域近年来景观生态风险的时空变化,并结合自然本底特征提出了巢湖流域生态安全格局分区优化建议。结果表明:2010~2022年,巢湖流域低风险小流域数量在减少,较低风险小流域数量后期开始增加,中等风险小流域在增加,较高、高风险小流域数量有减少趋势。对比发现,景观生态风险在区域各主要流域内部及主要流域之间差异性较大,但同一流域变化等级未出现越级变化现象,均为相邻等级之间转化,因此,同一主要流域景观生态风险随时间变化特征差异较小。基于巢湖流域自然本底及景观风险时空变化特征,提出了“两区、三廊、四片、两带”流域生态安全格局分区优化建议。

关键词：巢湖流域景观类型景观风险评价生态安全格局分区

“有害生物基因组学”课程思政与OBE教学设计

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教育教学论坛 2024年第14期 77-80页

作者：王华玲曾健勇李会平牟洪香河北农业大学林学院河北保定071000

“有害生物基因组学”是森林保护专业的专业拓展课程。在课程设计中坚持以OBE教育理念为导向,以课程思政教学效果为目标,采用线上线下混合教学模式,从教学内容、教学目标、教学方法、教学设计思路、教学评价等维度进行课程思政教学设计... 详细信息

“有害生物基因组学”是森林保护专业的专业拓展课程。在课程设计中坚持以OBE教育理念为导向,以课程思政教学效果为目标,采用线上线下混合教学模式,从教学内容、教学目标、教学方法、教学设计思路、教学评价等维度进行课程思政教学设计,致力于解决森林保护专业在教学实践中存在的课程思政碎片化、课程思政供给端和输出端不匹配等问题。基于OBE教育理念,在进行学情分析基础上对“有害生物基因组学”课程进行思政教学设计,将立德树人落在实处。

关键词： OBE理念课程思政基因组学

Early gastric cancer recurrence after endoscopic submucosal dissection:Not to be ignored!

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World Journal of Gastrointestinal Oncology 2024年第1期16卷 8-12页

作者： Yan zeng jian Yang Jun-Wen Zhang Department of Psychology The Second Affiliated Hospital of Chongqing Medical UniversityChongqing 400010China Department of Gastroenterology Changdu People's Hospital of XizangChangdu 854000Tibet Autonomous RegionChina Department of Gastroenterology The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China

This editorial comments on the article“Efficacy of multi-slice spiral computed tomography in evaluating gastric cancer recurrence after endoscopic submucosal dissection”.We focus on the importance of paying more attention to postendoscopic submucosal dissection(ESD)gastric cancer recurrence in patients with early gastric cancer(EGC)and how to manage it *** has been a wellknown treatment and the mainstay for EGC,with the advantages of less invasion and fewer complications when compared with traditional surgical *** a lower local recurrence rate after ESD,the problem of postoperative recurrence in patients with EGC has become increasingly non-ignorable with the global popularization of ESD technology and the increasing number of post-ESD patients.

关键词： Early gastric cancer Recurrence Endoscopic submucosal dissection Postoperative Prediction

Enhanced Grain Refining Effect of Mg–Zr Master Alloy on Magnesium Alloys via a Synergistic Strategy Involving Heterogeneous Nucleation and Solute‑Driven Growth Restriction

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1354-1366页

作者： Gang zeng Hong Liu Jing‑Peng Xiong jian‑Long Li Yong Liu Key Laboratory of Lightweight and High Strength Structural Materials of jiangxi Province School of Advanced ManufacturingNanchang UniversityNanchang 330031China

Zirconium(Zr)emerges as the most effective grain refiner for magnesium(Mg)alloys incorporating ***,Zr is introduced in the form of an Mg–Zr master ***,within Mg–Zr master alloys,Zr predominantly exists in a particle form,which tends to aggregate due to attractive van der Waals *** clustered Zr is prone to settling,thereby reducing its refining impact on Mg *** this work,a combined pretreatment process for Mg–Zr master alloys was proposed,encompassing the introduction of a physical field to intervene the agglomeration of particle Zr and the employ of high-temperature dissolution and peritectic reactions to promote the solid solution of *** results demonstrate that the particle Zr within the pretreated Mg–Zr master alloy is effectively dispersed and refined,and greater solute Zr levels can be *** subsequent grain refinement ability was studied on a typical Mg–6Zn–0.6Zr(wt%)*** outcome highlights that an improvement in the grain refinement efficacy(32.4%)of Mg–Zr master alloys was obtained with a holding time of 60 *** pretreated Mg–Zr master alloy significantly augments the efficiency of grain refinement for Mg alloys through a synergistic strategy involving heterogeneous nucleation and solute-driven growth *** crucial factor in achieving effective grain refinement of Zr in Mg alloys lies in regulating the presence and morphology of Zr in the Mg–Zr master alloy,distinguishing between particle Zr and solute *** study introduces a novel method for developing more efficient Mg–Zr refiners.

关键词： Magnesium alloy Mg-Zr master alloy Grain refinement Heterogeneous nucleation Solute-driven growth restriction Synergistic strategy

A highly efficient pathway to recover gold from acid aqueous solution by using an amidoxime-functionalized UHMWPE fiber

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Rare Metals 2019年第11期38卷 1105-1112页

作者： Yu-Lin Liang Chan Jin jiang-Tao Hu Zhen Liu Yan Li jian-Rong zeng Guo-Zhong Wu Xiang-Jun Wei Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

A new amidoxime-functionalized ultrahigh molecular weight polyethylene fibrous adsorbent(UHMWPEg-PAO) was used for the recovery of Au(III) from acid aqueous *** maximum experimental absorption capacity of UHMWPE-g-PAO fiber was found to be approximately 220.0 mg·g^-*** adsorption on UHMWPE-g-PAO was characterized by synchrotron radiation-based microcomputed tomography(SR-μ-CT),transmission electron microscopy(TEM),X-ray absorption near-edge structure spectroscopy(XANES) and synchrotron radiation-based Fourier transform infrared microspectroscopy(SR-FTIR).The SR-μ-CT and TEM results showed the distribution features of gold particles on the *** mechanism of Au(III) recovery from aqueous solutions by UHMWPE-g-PAO was based on the adsorbed Au(III) ions,which were reduced to metallic zero-valent gold(Au(0)) by amino groups(-NH2) in the amidoxime(AO)groups during the adsorption process,as confirmed by highresolution TEM(HRTEM) and XANES analyses.X-ray diffraction(XRD) results indicated that the incineration ashes contained metallic zero-valent *** conclusion,this amidoxime-functionalized fibrous adsorbent is a promising material for recovering gold from aqueous solution.

关键词： UHMWPE-g-PAO Adsorption mechanism Gold Reduction

Z-scheme systems of ASi_(2)N_4(A=Mo or W)for photocatalytic water splitting and nanogenerators

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Tungsten 2022年第1期4卷 52-59页

作者： jian zeng Liang Xu Xin Luo Tong Chen Shuai-Hao Tang Xin Huang Ling-Ling Wang Energy Materials Computing Center School of Energy and Mechanical EngineeringJiangxi University of Science and TechnologyNanchang 330013China Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan UniversityChangsha 410082China Department of Applied Physics School of ScienceEast China Jiaotong UniversityNanchang 330013China

Z-scheme heterojunction catalysts have received great attention due to their efficient ability to separate electrons and ***,using the first-principles calculations,we designed a series of promising two-dimensional(2D)/2D Z-scheme systems with interlayer inequivalent,including MoSi_(2)N_(4)/MoSi_(2)N_(4),WSi_(2)N_(4)/WSi_(2)N_(4) and MoSi_(2)N_(4)/WSi_(2)N_(4).Molecular dynamics simulation and phonon dispersion show that they have sufficient environmental *** inequivalent structure between the layers caused the directional formation of built-in potentials,driving the transfer of net charge between layers,which greatly enhanced their catalytic *** smaller band gap and enhanced light absorption performance further revealed their perfect catalytic ***,all they met the redox potential requirements of water splitting in a range of pH 0-7,demonstrate they are very remarkable photocatalysts for H_(2)*** interestingly,they also have good sliding ferroelectricity,and the opposite built-in potential can be obtained by sliding between layers,which is very promising for future *** works may provide new insights into energy conversion devices.

关键词： Tungsten MoSi_(2)N_4 WSi_(2)N_4 Z-scheme systems Water splitting Nanogenerators First-principles calculations