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Corrosion of.Y, f. and f.-15Y in H_2-H_2S Mixture under 10^(-3)Pa S_2 at 600～800℃

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Journal of.Materials Science & Technology 1996年第5期12卷 321-328页

作者： Yan NIU Weitao WU and Chaoliu ZENG (State Key Lab. f.r Corrosion and Protection, Institute of.Corrosion and Protection of.Metals,Chinese Academy of.Sciences, Shenyang 110015, China)f. Gesmundo and f. Viani (Instituto di Chimica, f.colta di Ingegneria, Un State Key Lab. f.r Corrosion and Protection Institute of Corrosion and Protection of Metals Chinese Academy of Sciences Shenyang 110015 China Instituto di Chimica Facolta di Ingegneria Universita di Genova Fiera del Mare. Pad. D 16129 Genova Italy

The corrosion of.an f.-based alloy containing 15 wt pct Y in H2-H2S mixtures under 10-3 Pa S2 was studied at 600~800℃ in an attempt to f.nd materials with improved sulphidation resistance with respect to pure f.. The presence of.Y has been shown to be benef.cial, but not suf.icient to the level expected. In f.ct, the alloy is able to f.rm at all tested temperatures an external f.S layer, beneath which a zone containing a mixture of.the two sulphides is also present. Thus,f. can still dif.use through this region to f.rm the outer f.S layer with non-negligible rate. The corrosion rate of.f. is considerably reduced by the Y addition. but the alloy corrodes still much more rapidly than Y. The sulphidation kinetics is generally rather irregular f.r both the pure metals, while the corrosion rate of.the alloy decreases with time and tends to become parabolic af.er an initial period of.12~17 h. The sulphidation behaviour of.the alloys is discussed by taking into account the presence of.an intermetallic compound f.17Y2 and the limited solubility of.Y in f.

关键词： f. and f.-15Y in H2-H2S Mixture under 10 Met OO Pa S2 at 600 Corrosion of.Y

An active self.cleaning surf.ce system f.r photovoltaic modules using anisotropic ratchet conveyors and mechanical vibration

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Microsystems & Nanoengineering 2020年第1期6卷 413-424页

作者： di Sun Karl f.Bohringer Department of.Electrical and Computer Engineering University of WashingtonSeattleWA 98195USA Institute f.r Nano-Engineered Systems University of WashingtonSeattleWA 98195USA

The purpose of.this work is to develop an active self.cleaning system that removes contaminants f.om a solar module surf.ce by means of.an automatic,water-saving,and labor-f.ee *** output ef.iciency of.a solar module can be degraded over time by dust accumulation on top of.the cover glass,which is of.en ref.rred to as“soiling”.This paper f.cuses on creating an active self.cleaning surf.ce system using a combination of.microsized f.atures and mechanical *** f.atures,which are termed anisotropic ratchet conveyors(ARCs),consist of.hydrophilic curved rungs on a hydrophobic *** dif.erent ARC systems have been designed and f.bricated with self.assembled monolayer(SAM)silane and f.uoropolymer thin f.lm(Cytop).f.brication processes were established to f.bricate these two systems,including patterning Cytop without degrading the original Cytop *** droplet transport characteristics,including anisotropic driving f.rce,droplet resonance mode,cleaning mechanisms,and system power consumption,were studied with the help of.a high-speed camera and custom-made test *** droplet can be transported on the ARC surf.ce at a speed of.27 mm/s and can clean a variety of.dust particles,either water-soluble or *** transmission was measured to show that Cytop can improve transmittance by 2.5~3.5%across the entire visible wavelength ***-time demonstrations of.droplet transport and surf.ce cleaning were perf.rmed,in which the solar modules achieved a 23 percentage-point gain af.er cleaning.

关键词： anisotropic cleaning remove

基于结构功能交叉神经网络的多模态医学图像融合

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光学精密工程 2024年第2期32卷 252-267页

作者：邸敬郭文庆任莉杨燕廉敬兰州交通大学电子与信息工程学院甘肃兰州730070

针对多模态医学图像融合中存在纹理细节模糊和对比度低的问题,提出了一种结构功能交叉神经网络的多模态医学图像融合方法。首先,根据医学图像的结构信息和功能信息设计了结构功能交叉神经网络模型,不仅有效地提取解剖学和功能学医学图... 详细信息

针对多模态医学图像融合中存在纹理细节模糊和对比度低的问题,提出了一种结构功能交叉神经网络的多模态医学图像融合方法。首先,根据医学图像的结构信息和功能信息设计了结构功能交叉神经网络模型,不仅有效地提取解剖学和功能学医学图像的结构信息和功能信息,而且能够实现这两种信息之间的交互,从而很好地提取医学图像的纹理细节信息。其次,利用交叉网络通道和空间特征变化构造了一种新的注意力机制,通过不断调整结构信息和功能信息权重来融合图像,提高了融合图像的对比度和轮廓信息。最后,设计了一个从融合图像到源图像的分解过程,由于分解图像的质量直接取决于融合结果,因此分解过程可以使融合图像包含更多的细节信息。通过与近年来提出的7种高水平方法相比,本文方法的AG,EN,Sf.MI,QAB/f.CC客观评价指标分别平均提高了22.87%,19.64%,23.02%,12.70%,6.79%,30.35%,说明本文方法能够获得纹理细节更清晰、对比度更好的融合结果,在主观视觉和客观指标上都优于其他对比算法。

关键词：多模态医学图像融合结构功能信息交叉网络注意力机制分解网络

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哈特曼-夏克波前传感器高精度球面波标定方法研究

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中国光学（中英文） 2024年第3期17卷 521-527页

作者：包明帝史国华邢利娜何益中国科学技术大学生物医学工程学院(苏州) 江苏苏州215163 中国科学院苏州生物医学工程技术研究所江苏苏州215163

为解决哈特曼-夏克波前传感器传统标定方法存在的测量精度低、稳定性不足等问题,提出了一种基于球面波的哈特曼-夏克波前传感器高精度绝对标定方法。通过理论推导获取了球面波的高精度标定方法,结合搭建的球面波标定实验装置,对子孔径数... 详细信息

为解决哈特曼-夏克波前传感器传统标定方法存在的测量精度低、稳定性不足等问题,提出了一种基于球面波的哈特曼-夏克波前传感器高精度绝对标定方法。通过理论推导获取了球面波的高精度标定方法,结合搭建的球面波标定实验装置,对子孔径数为128×128的哈特曼-夏克波前传感器完成高精度标定。该方法计算得到了哈特曼-夏克波前传感器结构参数f.w以及L_(0)的精确值。对标定后的哈特曼-夏克波前传感器的测量精度进行测试,实验结果表明,经本文方法标定后的哈特曼-夏克波前传感器的波前复原精度达到了PV=1.376×10^(-2)λ,RMS=4×10^(-3)λ(λ=625 nm),重复性精度为PV=3.2×10^(-3)λ,RMS=9.76×10^(-4)λ(λ=625 nm)。该方法可以为大口径的SHWf.完成高精度标定,提升测量精度。

关键词：哈特曼-夏克波前传感器绝对标定球面波前

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应用3种数据有限方法对印度洋近海金枪鱼类和马鲛类资源评估

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上海海洋大学学报 2024年第3期33卷 728-740页

作者：陈镝安朱江峰耿喆上海海洋大学海洋生物资源与管理学院上海201306 大洋渔业资源可持续开发教育部重点实验室上海201306 农业农村部大洋渔业开发重点实验室上海201306

近些年来印度洋近海金枪鱼类和马鲛类捕捞量上升较快,但因捕捞者多为个体手工渔业或小型工业渔业,渔业统计不完善,缺少传统资源评估所需的完整数据,因此这些鱼种目前缺乏可靠的评估。为了更好地掌握资源状况以制定相应的管理措施,本研... 详细信息

近些年来印度洋近海金枪鱼类和马鲛类捕捞量上升较快,但因捕捞者多为个体手工渔业或小型工业渔业,渔业统计不完善,缺少传统资源评估所需的完整数据,因此这些鱼种目前缺乏可靠的评估。为了更好地掌握资源状况以制定相应的管理措施,本研究使用1950—2020年捕捞量数据,运用CMSY模型(Monte carlo catch-msy)、DB-SRA模型(Depletion-based stock reduction analysis)和OCOM模型(Optimized catch-only assessmentmethod)等3种数据有限评估方法对圆舵鲣、扁舵鲣、巴鲣、青干金枪鱼、斑点马鲛、康氏马鲛等6个鱼种资源状况进行评估。基于相对生物量(B/B_(MSY))和相对捕捞死亡率(f.f.(MSY))进行判断,扁舵鲣和斑点马鲛的当前资源状态较为健康[P(B/B_(MSY)>1)=78%,P(f.f.(MSY)1)=78%,P(f.f.(MSY)1)=78%,P(f.f.(MSY)1)=78%,P(f.f.(MSY)1)=33%,P(f.f.(MSY)1)=55%,P(f.f.(MSY)<1)=33%]。3种模型中,CMSY模型和DBSRA模型给出的MSY估计值接近,CMSY模型给出了最为谨慎的评估结果(6个鱼种均存在过度捕捞),而OCOM模型给出的结果最为乐观,表明3种模型对这6个鱼种的资源状况判断有一定差异。敏感性分析显示,参数r以及Bend/K的先验设定均会对CMSY模型结果产生较大的影响;DB-SRA模型对Bt/K敏感,对K较为稳健。从结果上来看,3种模型均可以用于对近海小型金枪鱼和马鲛类的资源评估,但单一方法可能会导致结果偏差。建议在使用数据有限的评估方法时,采用多组参数以及多个方法进行比较分析,以更全面地获得种群资源状况。本研究可以为印度洋近海小型渔业管理提供参考。

关键词：近海金枪鱼马鲛类资源状况数据有限评估方法印度洋

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基于跨语种声学分析的帕金森病检测方法

电子与信息学报 2024年第2期46卷 546-554页

作者：季薇王传瑜吴迪李云郑慧芬南京邮电大学通信与信息工程学院南京210003 南京邮电大学计算机学院南京210023 南京医科大学附属老年医院南京210024

基于语音的帕金森病检测具有非介入式、成本较低和无创等优点。当前公开的帕金森病语音数据集大多来源于单一语种,存在数据容量不够大、受试者母语发音特点差异小等特点。单一语种数据集上训练的帕金森病检测模型在面对跨语种语音数据时... 详细信息

基于语音的帕金森病检测具有非介入式、成本较低和无创等优点。当前公开的帕金森病语音数据集大多来源于单一语种,存在数据容量不够大、受试者母语发音特点差异小等特点。单一语种数据集上训练的帕金森病检测模型在面对跨语种语音数据时,将出现性能下降。为避免语种差异带来的影响,提升模型在跨语种场景下的检测性能,该文引入对抗迁移学习和特征解耦的思想,提出一种帕金森病跨语种声学分析模型(CLSAM)。首先,将基于多头自注意力机制的Transf.rmer编码块和多层神经网络级联,组成特征提取器模块,用于将从源域和目标域语音中提取的原始f.ank语音特征初步解耦为两个向量,即域不变病理信息表征向量和域信息表征向量;设计了目标任务不一致的双重对抗训练模块,显式地分离域不变病理信息和域信息;最终,提取跨语种语音数据中的域不变病理信息用于帕金森病检测。该文在公开的MaxLittle帕金森病语音数据集以及自采的帕金森病语音数据集上,采用十折交叉验证的方法验证了所提方法的有效性。实验结果表明:与传统机器学习方法以及现有的迁移学习算法相比,所提模型在跨语种场景中的检测准确率、敏感度和f.分数等性能均有明显提升。

关键词：跨语种声学分析帕金森病对抗迁移学习特征解耦

Expression of.Strictosidine Synthase in Selected Subcellular Compartments of.Tobacco Plant

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Acta Botanica Sinica 2002年第5期44卷 579-582页

作者：王淼李秋荣 Stef.no di fiore Rainer f.SCHER 中国科学院沈阳应用生态研究所沈阳110016 沈阳军区总医院沈阳110016 Botanical Institute of.Rheinisch-Westf.ischTechnische Hochschule Aachen

Strictosidine synthase (STR) is a key enzyme involved in the biosynthesis of.terpenoid indole alkaloids (TIA) by condensing tryptamine and secologanin into strictosidine. The transgenic tobacco plants targeting STR to subcellular compartments were established to express STR in chloroplast, vacuole and endoplasmic reticulum (ER) by the tobacco stable transf.rmation. It was shown that STR was ef.ectively expressed in the above subcellular compartments by Western blot analysis and STR enzymatic assay. In vitro , STR enzymatic assay was measured indirectly by f.uorimetrically detecting depletion of.tryptamine f.eding on secologanin in the reaction mixture. The tryptamine were completely depleted by STR in the crude extract of.leaves of.transgenic tobacco plants targeting and expressing STR in the chloroplast, vacuole and ER, which ascertained the STR f.nctionally targeted to the three subcellular compartments. To conf.rm STR correct targeting and expressing in chloroplast, the chloroplasts were isolated and the f.actions of.purif.ed chloroplasts were analyzed by Western blot. The hypothesis of.STR correct targeting to the chloroplast was tested. The results have implications on our understanding of.the complex intracellular traf.icking in metabolic intermediates of.TIA biosynthesis.

关键词： Nicotiana tabacum strictosidine synthase subcellular compartment expression

Enhancing sensitivity of.triple-negative breast cancer to DNA-damaging therapy through chemical inhibition of.the m6A methyltransf.rase METTL3

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Cancer Communications 2024年第2期44卷 282-286页

作者： Bianca Cesaro Alessia Iaiza f.bio Piscopo Marco Tarullo Eleonora Cesari Dante Rotili Antonello Mai Alberto diana Michela Londero Luca Del Giacco Riccardo Masetti Alba di Leone Chiara Naro Silvia Masciarelli Giulia f.ntemaggi Claudio Sette f.ancesco f.zi Alessandro f.tica Department of.Anatomical HistologicalForensic&Orthopedic SciencesSection of Histology&Medical EmbryologySapienza University of RomeRomeItaly Department of.Biology and Biotechnologies“Charles Darwin” Sapienza University of RomeRomeItaly GSTeP Organoids Research Core f.cility Fondazione Policlinico A.Gemelli Istituto di Ricovero e Cura a Carattere Scientifico(IRCCS)RomeItaly Department of.Drug Chemistry and Technologies Sapienza University of RomeRomeItaly Pasteur Institute Cenci-Bolognetti FoundationSapienza University of RomeRomeItaly Department of.BioSciences University of MilanMilanItaly Multidisciplinary Breast Center Dipartimento Scienze della Salute della Donna e del Bambino e di SanitàPubblicaCatholic University of the Sacred HeartRomeItaly Department of.Neuroscience Section of Human AnatomyCatholic University of the Sacred HeartRomeItaly Oncogenomic and Epigenetic Unit IRCCS Regina Elena National Cancer InstituteRomeItaly

Dear Editor,N 6-methyladenosine(m^(6)A)is a critical mRNA modi-f.cation catalyzed by the enzyme methyltransf.rase-like 3(METTL3),with implications in RNA ***3 upregulation is associated with cancer progres-sion,metast... 详细信息

关键词： cancer methyltransf.rase metastasis

Expression of.Recombinant Tryptophan Decarboxylase in dif.erent Subcellular Compartments in Tobacco Plant

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Acta Botanica Sinica 2002年第3期44卷 314-317页

The gene encoded f.r tryptophan decarboxylase (TDC), which is the key enzyme in terpenoil indole alkaloids pathway, was targeted to dif.erent subcellular compartments and stably expressed in transgenic tobacco (Nicotiana tabacum L.) plants at the levels detected by Western blot and tryptamine accumulation analysis. It was shown that the TDC was located in subcellular compartments, the chloroplasts and cytosol. The recombinant TDC targeted to chloroplasts and cytosol in tobacco plants was ef.ectively expressed as soluble protein by Western blot analysis and enzymatic assay. The level of.tryptamine accumulation in chloroplast was higher than that in cytosol and very low in vacuole and endoplasmic reticulum (ER) to be hardly detected by Western blot analysis. It was indicated that the highest amount of.tryptamine was in chloroplasts, lower in endoplasmic reticula and the lowest in vacuoles as compared to those in wild type plants. The TDC targeted to dif.erent subcellular compartments of.tobacco plants and its expression level were studied by dif.erent nucleotide sequences coding signal peptides at 5'-end of.tdc gene in order to know the ef.ects of.the TDC in compartmentation on its f.nctionality.

关键词： tryptophan decarboxylase alkaloids biosynthetic pathway Nicotiana tabacum subcellular compartment