检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

机器学习在镁合金应用中的研究进展

工程科学学报 2024年第10期46卷 1797-1811页

作者：吴铮李全安陈晓亚郑泽宇张娜娜王政河南科技大学材料科学与工程学院洛阳471023 有色金属新材料与先进加工技术省部共建协同创新中心洛阳471023 龙门实验室洛阳471000 郑州大学计算机与人工智能学院郑州450000

在材料基因工程的背景下,基于数据驱动的机器学习技术作为一种强大的新型工具在镁合金的研究领域得到了广泛的关注.机器学习可以绕过几乎任何复杂的实验过程,只要确定描述符和目标属性之间的联系,就能以较低的成本,快捷地预测材料的性能... 详细信息

在材料基因工程的背景下,基于数据驱动的机器学习技术作为一种强大的新型工具在镁合金的研究领域得到了广泛的关注.机器学习可以绕过几乎任何复杂的实验过程,只要确定描述符和目标属性之间的联系,就能以较低的成本,快捷地预测材料的性能.传统的实验试错法和基于密度泛函理论的方法由于时间成本高、效率低,难以满足材料科学的不断发展需求.本文综述了机器学习在镁合金应用中的研究进展.首先简述了机器学习的基本流程和各种方法,主要包括数据集收集、数据预处理、模型构建和性能评估,并对机器学习算法的分类进行了总结.重点介绍了机器学习在镁合金加工工艺、显微组织、力学性能、耐蚀性能、储氢性能、固有属性(强化机制、各向异性等)和逆向设计等诸多方面应用的研究成就.机器学习模型不仅加速了新型高性能镁合金的设计过程,而且推动了镁合金塑性变形机理的深入研究.最后,分析了机器学习在镁合金研究应用中一些亟待解决的问题,并据此提出了机器学习在镁合金应用方面未来的研究方向和发展趋势.

关键词：机器学习镁合金性能预测合金设计数据驱动

Investigation on specific heat capacity and thermal behavior of sodium hydroxyethyl sulfonate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2017年第3期25卷 319-323页

作者： Hongying Hao Yadong Zhang xiaoya chen School of Chemical Engineering and Energy Zhengzhou University Medical School HuangHe Science and Technology College

The thermal decomposition process was studied by the TG–DTA analyzer. The results show that the decomposition process of sodium hydroxyethyl sulfonate consisted of three stages: the mass loss for the first, the second and third stages may be about the groups of CH_3CH_2OH, CH_3CHO and SO_2 volatilized, respectively. The decomposition residuum of three stages was analyzed by FT-IR, and the results of FT-IR agreed with the decomposition process predicted by theoretical weight loss. The specific heat capacity of sodium hydroxyethyl sulfonate was determined by differential scanning calorimetry(DSC). The melting temperature and melting enthalpy were obtained to be 465.41 K and 25.69 kJ·mol^(-1), respectively. The molar specific heat capacity of sodium hydroxyethyl sulfonate was determinated from 310.15 K to 365.15 K and expressed as a function of temperature.

关键词： Sodium hydroxyethyl sulfonate Melting temperature Specific heat capacity Thermal decomposition

Microstructure and mechanical properties of Mg-Gd-Y-Sm-Al alloy and analysis of grain refinement and strengthening mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2019年第12期37卷 1351-1358页

作者： xiaoya chen Quanan Li Jun chen Limin Zhu School of Materials Science and Engineering Xi'an University of TechnologyXi'an 740048China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Collaborative Innovation Center of Nonferrous Metals Henan ProvinceLuoyang 471023China

The effects of Sm on the microstructure and mechanical properties of Mg-11 Gd-2 Y-0.6 Al alloy were investigated by X-ray diffraction,optical microscopy,scanning electron microscopy,energy dispersive spectrometry and high resolution transmission electron *** on the theory of edge—edge matching and electronegativity theory,the mechanism of grain refinement is *** strengthening mechanism is expounded conveniently from fine grain strengthening,coherent strengthening,precipitation strengthening and grain boundary *** results show that the micro structure of Mg-11 Gd-2 Y-0.6 Al alloy is mainly composed of a-Mg matrix,Mg5 Gd and Mg24Y5 *** addition of Sm forms Mg41Sm5 phase in the alloy and refines the *** addition of Sm significantly improves the mechanical properties of the alloy at room and high *** the addition of Sm is 3 wt%,the tensile strengths of the alloy at room temperature and high temperature(200℃)reach the maximum value 292 and 321 MPa,*** fracture mode of the alloy at different temperatures is mainly brittle fracture and intercrystalline fracture.

关键词： Mg-11Gd-2Y-0.6Al alloy Micro structure Mechanical property Grain refinement Strengthening mechanism Rare earths

FeCe nanocomposite with high iron content as efficient catalyst for generation of COx-free hydrogen via ammonia decomposition

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2020年第10期38卷 1053-1059,I0001页

作者： Yingqiu Gu xiaoya chen Shuang Zhao Yuting Zhang Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials School of Chemistry&Materials ScienceJiangsu Normal UniversityXuzhou 221116China

FeCe nanocomposite catalysts with different iron contents were synthesized by a facile co-precipitation *** as-prepared materials were characterized by various techniques including powder X-ray diffraction(XRD),N2 adsorption/desorption and high-resolution transmission electron microscopy(HRTEM).Catalyst with the highest iron content(90 FeCe) shows the best activity for the hydrogen generation via ammonia decomposition.83% NH3 conversion is achieved at 550℃ and nearly full conversion of NH3 is realized at 600℃ with a GHSV of 24000 cm3/(gcat·h).The large content and small size crystal particles of iron species are responsible for the good catalytic *** reduction by hydrogen(H2-TPR) was performed to investigate the interaction between cerium and iron *** is found that slight cerium can exert strong interaction with iron compound thus effectively prevent the self-aggregation of active iron species,so as to improve the catalytic activity for ammonia decomposition.

关键词： FeCe nanocomposite Catalytic ammonia decomposition High iron content Hydrogen generation Rare earths

基于潜艇武器使用数据的“教、学、练、战”一体化教学模式构建及实施效果研究

在线全文

学校读者我要写书评

暂无评论

当代教育理论与实践 2024年第3期16卷 65-71页

作者：周杰马琪陈晓雅海军潜艇学院山东青岛266041

为实现军士培养目标精细化、教学过程专业化、考核评价科学化,必须充分利用信息时代的数据资源。本研究建立基于潜艇武器使用数据的“教、学、练、战”一体化教学模式,有效解决岗位需求变化响应不快、教学内容岗位导向不准、技能教学目... 详细信息

为实现军士培养目标精细化、教学过程专业化、考核评价科学化,必须充分利用信息时代的数据资源。本研究建立基于潜艇武器使用数据的“教、学、练、战”一体化教学模式,有效解决岗位需求变化响应不快、教学内容岗位导向不准、技能教学目标层次不高、职业能力要素养成不足四个关键问题,并在相关课程中开展实践应用,为提升学员解决武器使用相关实战问题的能力及促进具有较强创新实践能力的军士人才队伍建设,提供了可行的方法。

关键词：武器使用数据驱动一体化教学模式实施效果

维普期刊数据库博看期刊

大补阴丸联合生长贴对30例青春早期偏矮女童预测成年身高的影响

在线全文

学校读者我要写书评

暂无评论

中医儿科杂志 2024年第2期20卷 57-61页

作者：陈笑雅邵征洋宁波市江北区中医院中医科浙江宁波315020 杭州市红十字会医院中医儿科浙江杭州310000

目的观察大补阴丸联合生长贴综合治疗对青春早期偏矮女童性发育进程、骨龄增长及预测成年身高变化的影响。方法选取2021年11月至2022年11月在宁波市江北区中医院中医科门诊就诊的68例乳房处于B2期,骨龄正常或偏大的8~9岁身材偏矮女童,... 详细信息

目的观察大补阴丸联合生长贴综合治疗对青春早期偏矮女童性发育进程、骨龄增长及预测成年身高变化的影响。方法选取2021年11月至2022年11月在宁波市江北区中医院中医科门诊就诊的68例乳房处于B2期,骨龄正常或偏大的8~9岁身材偏矮女童,按照随机数字表法分为对照组和治疗组,因受疫情影响未能规律服药或贴敷治疗各脱落4例,最终每组30例。2组均给予饮食、运动、睡眠指导,对照组口服中成药大补阴丸,治疗组在对照组治疗方法的基础上联合生长贴穴位贴敷治疗,2组均连续治疗6个月后统计疗效。结果治疗后,治疗组的身高、生长速度(GV)、身高标准差数值差(△HtSDS)、预测成年身高(△PAH)均较对照组显著升高,2组比较,差异均有统计学意义(P0.05)。治疗前2组的子宫及卵巢容积比较,差异无统计学意义(P>0.05),具有可比性;治疗后2组的子宫及卵巢容积均较同组治疗前显著缩小,差异均有统计学意义(P0.05)。治疗前2组的血清类胰岛素生长因子-1(IGF-1)水平比较,差异无统计学意义(P>0.05),具有可比性;治疗后对照组的血清IGF-1水平与同组治疗前比较,差异无统计学意义(P>0.05),而治疗组与同组治疗前及对照组治疗后比较,血清IGF-1水平均显著上升,差异均有统计学意义(P<0.01)。治疗过程中,对照组未见明显不良反应,治疗组出现2例贴敷部位皮肤发红,但不影响治疗。结论大补阴丸联合生长贴治疗青春早期偏矮女童,在减缓性发育及骨龄进展的同时,可以加速身高增长,提高血清IGF-1水平,使预测成年身高增加,且未见明显不良反应,值得临床推广应用。

关键词：偏矮女童青春早期大补阴丸生长贴预测成年身高临床观察

Transcriptome analysis of three cotton pests reveals features of gene expressions in the mesophyll feeder Apolygus lucorum

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2017年第8期60卷 826-838页

作者： Dianyang chen Fangyan chen Chunyu chen xiaoya chen Yingbo Mao National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and EcologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200032China University of Chinese Academy of Sciences Beijing 100049China

The green mirid bug Apolygus lucorum is an agricultural pest that is known to cause damage to more than 150 plant species. Here, we report the transcriptomes ofA. lucorum at three different developmental stages （the second and fifth instar nymphs and adults）. A total of 98,236 unigenes with an average length of 1,335nt was obtained, of which 50,640 were annotated, including those encoding digestive enzymes and cytochrome P450s. Comparisons with cotton bollworm and cotton aphid transcriptomes revealed distinct features ofA. lucorum as a mesophyll feeder. The gene expression dynamics varied during development from young nymphs to adults. The high-quality transcriptome data and the gene expression dynamics reported here provide valuable data for a more comprehensive understanding of the physiology and development of mirid bugs, and for mining targets for their control.

关键词： Apolygus lucorum transcriptome digestion enzymes developmental stage

Engineering purple rice for human health

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2018年第3期61卷 365-367页

作者： Xin Fang Yingbo Mao xiaoya chen National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant Sciences Institute of Plant Physiology and Ecology SIBS Chinese Academy of Sciences Plant Science Research Center Shanghai Key Laboratory of Plant Functional Genomics and ResourcesShanghai Chenshan Botanical Garden

Human history of domestication of wild plants as food source has witnessed continuous improvement in nutritional qualities of plant products. However, some nutritional traits were lost during agriculatral breeding （Tieman et al., 2017）, and some are absent in certain wild ancestors and could not be introduced into modem crops by traditional breeding. Micronutrient and phytonutrient deficiencies have devastat- ing effects to human health, especially to poor populations （FAO, 2013）, biofortification of food crops by molecular breeding is important to resolve these problems. Currently, there are two main strategies for biofortification, one is to increase level of already existing health-promotion com- pounds in plants, such as anthocyanin-enriched ＂Purple Tomatoes＂（Butelli et al., 2008） and folate-enriched rice （Blancquaert et al., 2015）. The other is to transfer a biosyn- thetic pathway of bioactive compounds into a plant organ absent of them, such as 13-carotene-enriched ＂Golden Rice＂（Ye et al., 2000; Paine et al., 2005）; this strategy is mostly a difficult task using conventional cloning vector systems or current transgene-stacking vector systems that enable assembly of limited numbers of target genes into single vectors with sophisticated strategies, such as using homing endonuclease sites or Multisite Gateway. Thus,

关键词：健康米饭紫色植物产品工程食物来源调制解调器繁殖期

Extrafloral nectary-the sleeping beauty of plant science

在线全文

学校读者我要写书评

暂无评论

Journal of Cotton Research 2020年第1期3卷 63-64页

作者： chen xiaoya CAS Center for Excellenee in Molecular Plant Sciences/Shanghai Institute of Plant Physiology and Ecology Chinese Academy of Sciences300 Fenglin RoadShanghai 200032China

Cotton is one of the most important cash crops,its growth season coincides with a high incidence of diverse groups of pests,leading to heavy use of *** identification of a signaling protein as a candidate regulator of cotton extrafloral nectary provides a new insight into the formation of sophisticated defense mechanisms in plants.

关键词： Extrafloral nectary PB1 domain Ga NEC1I Cotton Gossypium Indirect defense Insect