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基于FUSE的EXT2文件系统实验教学改革 认领 引用
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作者 夏文 仇洁婷 +4 位作者 潘延麒 杨大荣 区文灏 邓才 李诗逸 《计算机教育》 2026年第5期173-179,共7页
针对传统操作系统课程中的文件系统实验存在模块化认知局限、内核态开发调试复杂度高及平台依赖性制约等问题,提出基于用户态文件系统框架(Filesystem in Userspace,FUSE)的第二代扩展文件系统(Second Extended Filesystem,EXT2)实验教... 针对传统操作系统课程中的文件系统实验存在模块化认知局限、内核态开发调试复杂度高及平台依赖性制约等问题,提出基于用户态文件系统框架(Filesystem in Userspace,FUSE)的第二代扩展文件系统(Second Extended Filesystem,EXT2)实验教学改革方案,具体阐述如何通过分层解耦架构设计,构建包含存储介质虚拟化层、驱动抽象层与文件系统实现层的跨平台用户态开发实验环境,采用“基础认知—系统实现—创新拓展”分阶段递进式路径并配套自动化评测体系,最后说明教学改革效果。 展开更多
关键词 FUSE框架 EXT2文件系统 操作系统实验教学 自动评测
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Irradiation effects of CO_2 laser parameters on surface morphology of fused silica 认领 引用 被引量：8
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作者 向霞 郑万国 +6 位作者 袁晓东 戴威 蒋勇 李熙斌 王海军 吕海兵 祖小涛 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第4期350-355,共6页
To understand the surface morphology evolution of fused silica induced by 10.6μm CO2 laser irradiation at different parameters, this paper reports that optical microscopy, profilometry, and hydrophilicity tests are u... To understand the surface morphology evolution of fused silica induced by 10.6μm CO2 laser irradiation at different parameters, this paper reports that optical microscopy, profilometry, and hydrophilicity tests are utilized to characterize the surface structure and roughness of the laser irradiated area. The results show that three typical surface morphologies and two typical hydrophilicity test images are observed at different laser powers and pulse durations. The correlations between surface temperature and surface morphology as well as hydrophilicity behaviours are presented. The different hydrophilicity behaviours are related to surface structures of the laser-induced crater and thermal diffusion area. The thermal diffusion length monotonously increases with increasing laser power and pulse duration. The crater width is almost determined by the laser beam size. The crater depth is more sensitive to the laser power and pulse duration than the crater width. 展开更多
关键词 CO2 laser irradiation fused silica surface structure hydrophilicity
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Influence of secondary treatment with CO_2 laser irradiation for mitigation site on fused silica surface 认领 引用 被引量：2
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作者 蒋勇 周强 +10 位作者 邱荣 高翔 王慧丽 姚彩珍 王俊波 赵鑫 刘春明 向霞 祖小涛 袁晓东 苗心向 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第10期475-481,共7页
The ablation debris and raised rim, as well as residual stress and deep crater will be formed during the mitigation of damage site with a CO2 laser irradiation on fused silica surface, which greatly affects the laser ... The ablation debris and raised rim, as well as residual stress and deep crater will be formed during the mitigation of damage site with a CO2 laser irradiation on fused silica surface, which greatly affects the laser damage resistance of optics. In this study, the experimental study combined with numerical simulation is utilized to investigate the effect of the secondary treatment on a mitigated site by CO2laser irradiation. The results indicate that the ablation debris and the raised rim can be completely eliminated and the depth of crater can be reduced. Notable results show that the residual stress of the mitigation site after treatment will reduce two-thirds of the original stress. Finally, the elimination and the controlling mechanism of secondary treatment on the debris and raised rim, as well as the reasons for changing the profile and stress are analyzed. The results can provide a reference for the optimization treatment of mitigation sites by CO2laser secondary treatment. 展开更多
关键词 fused silica CO_2 laser numerical simulation secondary treatment
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Integration of a fused silica capillary and in-situ Raman spectroscopy for investigating CO2 solubility in n-dodecane at near-critical and supercritical conditions of CO2 认领 引用 被引量：1
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作者 Jun-Liang Wang Zi-Hao Song +4 位作者 Lin-Jun Li Li-Li Yang Quan-Yuan Wang I-Ming Chou Zhi-Yan Pan 《Petroleum Science》 SCIE CAS CSCD 2022年第6期3124-3133,共10页
To determine the solubility of CO2in n-dodecane at T=303.15-353.15 K,P≤11.00 MPa,an integrated fused silica capillary and in-situ Raman spectroscopy system was built.The Raman peak intensity ratio(I_(CO2)/IC-H)... To determine the solubility of CO2in n-dodecane at T=303.15-353.15 K,P≤11.00 MPa,an integrated fused silica capillary and in-situ Raman spectroscopy system was built.The Raman peak intensity ratio(I_(CO2)/IC-H)between the upper band of CO2Fermi diad(I_(CO2))and the C-H stretching band of n-dodecane(IC-H)was employed to determine the solubility of CO2in n-dodecane based on the calibrated correlation equation between the known CO2molality in n-dodecane and the I_(CO2)/IC-Hratio with R2=0.9998.The results indicated that the solubility of CO2decreased with increasing temperature and increased with increasing pressure.The maximum CO2molality(30.7314 mol/kg)was obtained at 303.15 K and7.00 MPa.Finally,a solubility prediction model(lnS=(P-A)/B)based on the relationship with temperature(T in K)and pressure(P in MPa)was developed,where S is CO2molality,A=-8×10-6T2+0.0354T-8.1605,and B=0.0405T-10.756.The results indicated that the solubilities of CO2derived from this model were in good agreement with the experimental data. 展开更多
关键词 CO2solubility n-dodecane Raman spectroscopy Fused silica capillary In-situ
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Synthesis of fused pyran and arylbis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)methane in ionic liquid 认领 引用 被引量：2
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作者 Xue Sen Fan Ying Ying Qu +2 位作者 Xin Ying Zhang Xia Wang Jian Ji Wang 《Chinese Chemical Letters》 SCIE CAS 2009年第4期387-390,共4页
Promoted and mediated by an ionic liquid-[bmim][BF4],fused pyrans or arylbis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)methanes were efficiently and selectively prepared from the reaction of aldehyde and 4-hydroxy-6-meth... Promoted and mediated by an ionic liquid-[bmim][BF4],fused pyrans or arylbis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)methanes were efficiently and selectively prepared from the reaction of aldehyde and 4-hydroxy-6-methyl-2-oxo-pyran with or without acetic anhydride.By using these novel procedures,pyrimidine nucleoside-fused pyran and arylbis(pyranon-3-yl)methane hybrids with potential biological activities were constructed. 展开更多
关键词 Ionic liquid Fused pyran Arylbis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)methane Pyrimidine nucleoside Green synthesis
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MICROSTRUCTURE IN LASER FUSED HIGH SPEED STEEL W6Mo5Cr4V2(M2) 认领 引用 被引量：2
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作者 LIU Ning CUI Kun Huazhong University of Science and Technology,Wuhan.China DENG Zonggang Hefei University of Technology,Hefei,China CHENG Benpei KONG Jie Institute of Solid State Physics,Academia Sinica,Hefei,China Doctorate student,Department of Mechanical Engineering No.2,Huazhong University of Science and Technology,Wuhan 430074,China 《Acta Metallurgica Sinica(English Letters)》 CAS 1993年第1期36-39,共4页
Microstructure of the deepest zone of high speed steel W6Mo5Cr4V2(M2)melt after laser fu-sion was found to be so fine as the ehill zone of a solidified ingot.When narrower chill zoneformed,the long columnar dendrites ... Microstructure of the deepest zone of high speed steel W6Mo5Cr4V2(M2)melt after laser fu-sion was found to be so fine as the ehill zone of a solidified ingot.When narrower chill zoneformed,the long columnar dendrites grow into the melt and then the fine equiaxed cellularstructure appears in upper melt region nearly surface.The substructure of cellular grains anddendrites was observed to consist of martensite and retained austenile,while the carbides asM_6C_■ Cr_7C_3 and MC distributed at their boundaries.It is believed that the highermicrohardness up to HV0.1=865-960 of the laser fused structure of the alloy is due to the oc-currence of martensite. 展开更多
关键词 High speed steel W6Mo5Cr4V2(M2) laser fused treatment micrstructure
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CaO-Al2O3-B2O3-SiO2玻璃对熔融石英析晶行为的影响 认领 引用
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作者 田宇 梁峰 +3 位作者 吕功业 谷昊辉 何冈骏 张海军 《耐火材料》 CAS 北大核心 2026年第3期192-197,共6页
为有效抑制熔融石英粉高温相变析晶,以熔融石英粉体(粒径≤74μm)、九水合硝酸铝、四水合硝酸钙、硅溶胶(固相质量分数为30%)、五水合硝酸镱等为原料,采用溶胶-凝胶法,制备了CaO-Al2O3-B2O3-SiO2(CABS)玻璃包覆熔融石英... 为有效抑制熔融石英粉高温相变析晶,以熔融石英粉体(粒径≤74μm)、九水合硝酸铝、四水合硝酸钙、硅溶胶(固相质量分数为30%)、五水合硝酸镱等为原料,采用溶胶-凝胶法,制备了CaO-Al2O3-B2O3-SiO2(CABS)玻璃包覆熔融石英颗粒,研究了玻璃相添加量(添加质量分数0~9%)、煅烧温度(1100~1300℃)、保温时间(0.5~3 h)及五水合硝酸镱添加量(B2O3和Yb2O3的物质的量比分别为9∶1、7∶3、5∶5)对熔融石英析晶行为的影响。结果表明:随着煅烧温度的升高,试样的晶化率逐渐升高;CABS玻璃相的引入可显著抑制熔融石英粉在高温条件下的相变析晶,随着玻璃相添加量的增加,试样的晶化率先降低后升高,当玻璃相添加量为7%(w)时,经1300℃保温2 h后试样的晶化率仅为10.01%(w),较未添加玻璃相试样的降低了86.3%;随着五水合硝酸镱添加量的增加,试样的晶化率先升高后降低,当B2O3和Yb2O3的物质的量比为9∶1时,经1300℃保温2 h煅烧后试样的晶化率为10.66%(w),较未添加玻璃相试样的降低了85.4%。 展开更多
关键词 熔融石英 溶胶-凝胶法 析晶行为 Yb2O3
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Effect of reaction conditions and kinetic study on the Fischer-Tropsch synthesis over fused Co-Ni /Al_2O_3 catalyst 认领 引用 被引量：2
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作者 P. NikDarsa A. A. Mirzaei H. Atashi 《燃料化学学报》 CSCD 北大核心 2014年第6期710-718,共9页
Co-Ni/Al2O3catalyst was prepared by the fusion method and used in Fischer-Tropsch synthesis(FTS).The catalysts were characterized by means of nitrogen sorption and scanning electron microscopy.The effect of some react... Co-Ni/Al2O3catalyst was prepared by the fusion method and used in Fischer-Tropsch synthesis(FTS).The catalysts were characterized by means of nitrogen sorption and scanning electron microscopy.The effect of some reaction conditions such as temperature,pressure and H2/CO feed ratio on the catalytic performance of Co-Ni/Al2O3in CO hydrogenation was investigated in a fixed-bed reactor.The results indicate that the optimum reaction conditions are 250℃,0.3 MPa,H2/CO feed ratio of 2.0,and GHSV of 3 000 h-1.Kinetically,the reaction rate was correlated with the Langmuir-Hinshelwood-Hougen-Watson type models.The activation energy for the best fitted model is 88.41 kJ/mol,suggesting that the intra-particle mass transport is not significant. 展开更多
关键词 fused Co—Ni Al2O3 Fischer—Tropsch synthesis kinetics modeling reaction conditions CO consumption activation energy
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Effects of Electro-fused Magnesia on Properties of Al_2O_3-SiC-C Castable 认领 引用
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作者 HAN Bingqiang LI Yousheng LI Nan 《China's Refractories》 CAS 2008年第3期14-17,共4页
Al2O3-SiC-C castables for iron trough with fused magnesia powder （0, 3%, 6%, 9% and 12%） were prepared with brown fused corundum particles （5-3mm, 3-1mm, ≤1mm）, white fused corundum powder （≤0.088mm）, SiC part... Al2O3-SiC-C castables for iron trough with fused magnesia powder （0, 3%, 6%, 9% and 12%） were prepared with brown fused corundum particles （5-3mm, 3-1mm, ≤1mm）, white fused corundum powder （≤0.088mm）, SiC particle （≤1mm） and powder （ ≤0.088mm）, fused magnesia powder （ ≤0. 088mm）, reactive α-Al2O3 micropowder, ultrafine SiO2 , Si powder and sphere pitch as main starting materials and calcium aluminate cement as binder. The specimens were fired at 1100℃ and 1450℃ for 3 h after vibrating moulding, curing, demoulding and drying at 110℃ for 24 h. Bulk density, apparent porosity, linear change rate, modulus of rupture, resistance to blast furnace slag, oxidation resistance, phase composition and microstructure of the specimens were analyzed. The results show that： （1） With fused magnesia addition increasing, apparent porosity increases, while bulk density, modulus of rupture and oxidation resistance decline, slag resistance varies slightly; （2） The main crystal phases in the specimens fired at 1450℃ for 3 h are 3C-SiC, 6H-SiC, corundum, periclase, reaction-synthesized spinel and mullite; the quantity of the formed spinel and mullite increases with the increase of fuzed magnesite addition; （3） Along the corroded side, spinel layer with about 80μm thickness forms at the co- rundum particles boundary. 展开更多
关键词 fused magnesia Blast trough Al2O3 -SiC - C castable spinel
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Mitigation of laser damage growth in fused silica by using a non-evaporative technique 认领 引用 被引量：7
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作者 蒋勇 刘春明 +8 位作者 罗成思 袁晓东 向霞 王海军 贺少勃 吕海兵 任玮 郑万国 祖小涛 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第5期316-322,共7页
A non-evaporative technique is used to mitigate damage sites with lateral sizes in a range from 50 μm to 400 μm and depths smaller than 100 μm.The influence of the pulse frequency of a CO 2 laser on the mitigation ... A non-evaporative technique is used to mitigate damage sites with lateral sizes in a range from 50 μm to 400 μm and depths smaller than 100 μm.The influence of the pulse frequency of a CO 2 laser on the mitigation effect is studied.It is found that a more symmetrical and smooth mitigation crater can be obtained by increasing the laser pulse frequency form 0.1 to 20 kHz.Furthermore,the sizes of laser-affected and distorted zones decrease with the increase of the laser pulse frequency,leading to less degradation of the wave-front quality of the conditioned sample.The energy density of the CO 2 laser beam is introduced for selecting the mitigation parameters.The damage sites can be successfully mitigated by increasing the energy density in a ramped way.Finally,the laser-induced damage threshold（LIDT） of the mitigated site is tested using 355 nm laser beam with a small spot（0.23 mm 2） and a large spot（3.14 mm 2）,separately.It is shown that the non-evaporative mitigation technique is a successful method to stop damage re-initiation since the average LIDTs of mitigated sites tested with small or large laser spots are higher than that of pristine material. 展开更多
关键词 fused silica CO2 laser non-evaporative technique energy density
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高稳定性介孔MgO-ZrO2纳米复合物对CO2吸附性能研究 认领 引用 被引量：9
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作者 付新 刘水刚 +4 位作者 李军平 赵宁 肖福魁 魏伟 孙予罕 《精细化工》 CAS 北大核心 2008年第11期1092-1096,共5页
用溶胶-凝胶法制备了介孔MgO-ZrO2纳米复合物,并通过XRD、氮吸附和CO2-TPD等手段表征了材料的结构特征和表面性质。XRD、氮吸附结果表明此纳米复合物具有典型的介孔结构,比表面积达183-212 m^2/g,并且有较好的热稳定性,在700℃以下介孔... 用溶胶-凝胶法制备了介孔MgO-ZrO2纳米复合物,并通过XRD、氮吸附和CO2-TPD等手段表征了材料的结构特征和表面性质。XRD、氮吸附结果表明此纳米复合物具有典型的介孔结构,比表面积达183-212 m^2/g,并且有较好的热稳定性,在700℃以下介孔孔道不会坍塌。另一方面,这种纳米复合物表面具有适中的碱性,其碱性位与基体结合牢固,稳定性好。由于其具有发达的孔隙和适中的碱性,二氧化碳在其表面的吸附量达1.6 mmol/g,且经数次循环后材料的吸附性能无明显下降。 展开更多
关键词 CO2吸附 高稳定性 介孔 MgO-ZrO2 纳米复合物 催化与分离提纯技术
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MgO-ZrO_2材料的抗侵蚀性能研究 认领 引用 被引量：10
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作者 程本军 杨彬 +1 位作者 王金相 钟香崇 《耐火材料》 EI CAS 北大核心 2004年第1期15-17,共3页
研究了氧化锆和锆英石对镁质耐火材料抗渣性的影响。结果表明 :在氧化锆的加入量未达到某一临界值以前 ,镁质耐火材料的抗侵蚀性没有明显提高 ,因为加入的氧化锆量不足以形成阻挡渣渗透和侵蚀的二氧化锆富集层或锆酸钙富集层 ;当氧化锆... 研究了氧化锆和锆英石对镁质耐火材料抗渣性的影响。结果表明 :在氧化锆的加入量未达到某一临界值以前 ,镁质耐火材料的抗侵蚀性没有明显提高 ,因为加入的氧化锆量不足以形成阻挡渣渗透和侵蚀的二氧化锆富集层或锆酸钙富集层 ;当氧化锆的加入量超过一定量以后 ,镁质耐火材料的抗侵蚀性显著提高。锆英石的加入对提高镁质耐火材料抗侵蚀性的作用不明显 :加入量少时 ,渣渗透较严重 ;加入量多时 ,渣的渗透虽有所抑制 。 展开更多
关键词 MgO-ZrO2材料 抗侵蚀性能 镁质耐火材料 氧化锆 锆英石
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高稳定性介孔MgO-ZrO_2固体碱的制备及其高温CO_2吸附性能 认领 引用 被引量：6
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作者 李碧 闻霞 +5 位作者 赵宁 王秀枝 魏伟 孙予罕 任泽厚 王志杰 《燃料化学学报》 北大核心 2010年第4期473-477,共5页
以无机盐Zr(NO3)4与Mg(NO3)2为原料,聚氧乙烯-聚氧丙烯-聚氧乙烯嵌段型聚醚(P123)作模板剂,合成了纳米介孔MgO-ZrO2复合材料,并通过XRD、N2吸附-脱附、CO2-TPD、TG等方法对材料进行了表征。结果表明,合成的MgO-ZrO2具有介孔结构,比表面... 以无机盐Zr(NO3)4与Mg(NO3)2为原料,聚氧乙烯-聚氧丙烯-聚氧乙烯嵌段型聚醚(P123)作模板剂,合成了纳米介孔MgO-ZrO2复合材料,并通过XRD、N2吸附-脱附、CO2-TPD、TG等方法对材料进行了表征。结果表明,合成的MgO-ZrO2具有介孔结构,比表面积较大;且材料在反复CO2吸附-脱附应用过程中,能够完全再生。此外,材料具有典型的固溶体结构,Mg2+进入四方相ZrO2晶格中并取代Zr4+,形成了一种特殊碱性位。这种碱性位与基体结合牢固,不易流失。考察了MgO-ZrO2材料在150℃高温下的CO2吸附性能,发现材料具有较高的吸附速率(0.084 mmol/(g.min))和吸附量(1.01 mmol/g),是一种可循环利用的吸附材料。 展开更多
关键词 高温CO2吸附 高稳定性 MgO-ZrO2 固体碱
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添加剂CaO和Y_2O_3对MgO-ZrO_2材料性能的影响 认领 引用 被引量：3
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作者 陈松林 袁林 +5 位作者 冯中起 曾大凡 刘锡俊 曾鲁举 孙加林 王健东 《材料热处理学报》 EI CAS 北大核心 2010年第10期10-15,共6页
镁锆砖具有优异的高温性能和抗渣性能,但生产中会出现表面龟裂等外观缺陷,为解决MgO-ZrO2耐火材料在烧结时相变导致的龟裂,研究了CaO添加剂和烧结助剂Y2O3对MgO-ZrO2材料性能的影响。结果表明,在镁锆砖中添加的CaO首先和ZrO2发生反应,... 镁锆砖具有优异的高温性能和抗渣性能,但生产中会出现表面龟裂等外观缺陷,为解决MgO-ZrO2耐火材料在烧结时相变导致的龟裂,研究了CaO添加剂和烧结助剂Y2O3对MgO-ZrO2材料性能的影响。结果表明,在镁锆砖中添加的CaO首先和ZrO2发生反应,而不和MgO发生反应或固溶,添加的CaO没有起到强化镁锆砖的作用,反而由于存在高温时的扩散过程和化学反应之间的定态耦合,致使CaO和Y2O3会发生逆向扩散,在晶界处富集偏析,出现非化学热力学平衡态的稳定结构,使得镁锆砖的高温韧性变差,耐热震性能变差。 展开更多
关键词 MgO-ZrO2耐火材料 添加剂 材料性能 非平衡态热力学
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Synthesis of polycyclic spiro-fused indolines via IBX-mediated cascade cyclization 认领 引用 被引量：1
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作者 Zhiguo Zhang Xiaoqing Song +6 位作者 Guofeng Li Xiang Li Dan Zheng Xuna Zhao Huanran Miao Guisheng Zhang Lantao Liu 《Chinese Chemical Letters》 SCIE CAS CSCD 2021年第4期1423-1426,共4页
We report a 2-iodoxybenzoic acid(IBX)-mediated intarmolecular oxidative spiro-fused tandem cyclization reaction of tryptophan analogs bearing an N-arylamides side-chain to rapidly afford polycyclic spiroindolines feat... We report a 2-iodoxybenzoic acid(IBX)-mediated intarmolecular oxidative spiro-fused tandem cyclization reaction of tryptophan analogs bearing an N-arylamides side-chain to rapidly afford polycyclic spiroindolines featuring multiple stereocenters including a quaternary stereocenters under mild reaction conditions.Among them,a novelty azaphosphol idine-containing spiroindoline compound is synthesized for the first time.It may open the door to azaphos pholidine-containing spiroindoline compound of potential interest in synthetic and medicinal chemistry.A plausible mechanism is proposed. 展开更多
关键词 Spiro-indolines Fused indolines 2-Iodoxybenzoic acid Hypervalent iodine reagents
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Skeleton Editing of 2-Aryloxazines with CF3-ynones Leading to Isoindolone Fused CF3-Benzooxazocines Possessing Potent Anti-ZIKV and Anti-Cancer Activities 认领 引用 被引量：1
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作者 Hong Jiang Kangli Liu +6 位作者 Wenqing Yang Jiayi Zou Meng Yuan Chunhua Ma Jianhua Wang Xinying Zhang Xuesen Fan 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2026年第2期198-204,共7页
One of the most profound goals of modern organic chemistry is to enrich synthetic method and compound library serving as the foundation of pharmaceutical and material sciences.Meanwhile,the synthesis of structurally c... One of the most profound goals of modern organic chemistry is to enrich synthetic method and compound library serving as the foundation of pharmaceutical and material sciences.Meanwhile,the synthesis of structurally complex compounds necessitates tedious multistep procedures.This is certainly not in line with the requirements of green chemistry.Therefore,there is a strong impetus for the development of more concise and sustainable approaches to obtaining such compounds.So far,a number of state-of-the-art strategies for this purpose have been developed. 展开更多
关键词 Isoindolone fused benzooxazocines Skeleton editing 2-Aryl-4H-benzo[d][1,3]oxazine CF3-ynone C-H bond activation Anti-ZIKV activity Anti-cancer activity Cascade reaction
Study on Synthesis of Heterocycle-Fused Troponoid Compounds 认领 引用
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作者 Wen Tao GAO Zhuo ZHENG 《Chinese Chemical Letters》 SCIE CAS 2000年第6期503-504,共2页
3-Acetyltropolone 1 reacted with 3,4,5-trimethoxybenzaldehyde et al. to afford 2 similar to 5. 2-Acetyl-7-methylaminotropone 7 reacted with 3, 1,5-trimethoxybenzaldehyde el al, to gave 8 similar to 10. Compound 1 reac... 3-Acetyltropolone 1 reacted with 3,4,5-trimethoxybenzaldehyde et al. to afford 2 similar to 5. 2-Acetyl-7-methylaminotropone 7 reacted with 3, 1,5-trimethoxybenzaldehyde el al, to gave 8 similar to 10. Compound 1 reacted with 3,4,5-trimethoxybenzaldehyde in the presence of ethyl orthoformate and perchloric acid to afford 6. Compounds 3,5 reacted with hydroxylamine to give 11, 12. The reactions of 3,5 with phenylhydrazine gave 13, 14. 展开更多
关键词 3-acetyltropolone 2-acetyl-7-methylaminotropone heterocycle-fused troponoid
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添加电熔MgO-ZrO_2共晶砂对低碳MgO-C砖性能的影响 认领 引用 被引量：8
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作者 何见林 顾华志 +1 位作者 汪厚植 邓良奎 《武汉科技大学学报》 CAS 2008年第2期176-179,共4页
在以电熔镁砂、鳞片石墨为原料、酚醛树脂为结合剂的低碳MgO-C砖中,分别添加10%,15%,20%的电熔MgO-ZrO2共晶砂替代镁砂,经200,1000,1500℃处理后,对材料的体积密度、显气孔率、耐压强度、线变化率、热膨胀率和抗氧化性进行了检测,并借助... 在以电熔镁砂、鳞片石墨为原料、酚醛树脂为结合剂的低碳MgO-C砖中,分别添加10%,15%,20%的电熔MgO-ZrO2共晶砂替代镁砂,经200,1000,1500℃处理后,对材料的体积密度、显气孔率、耐压强度、线变化率、热膨胀率和抗氧化性进行了检测,并借助XRD研究了试样的物相组成和显微结构。结果表明,随着电熔MgO-ZrO2共晶砂加入量的增加,试样的体积密度逐渐增大,线变化率逐渐减小,耐压强度和抗氧化性均为先增大后减小,试样的热膨胀率逐渐减小,抗热震性得到提高。材料性能的变化主要与电熔MgO-ZrO2共晶砂的体积密度大、热膨胀系数小、氧化锆的相变、镁铝尖晶石和镁橄榄石等物相的生成相关。 展开更多
关键词 电熔MgO-ZrO2共晶砂 低碳 MgO-C砖
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电熔MgO-ZrO_2原料显微结构的研究 认领 引用 被引量：1
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作者 王纯 袁磊 于景坤 《材料与冶金学报》 CAS 2011年第2期108-111,共4页
以轻烧氧化镁和锆英石为原料,采用电熔法制备了MgO-ZrO2合成料,利用扫描电子显微镜和能谱仪对材料的显微结构进行了分析,计算了材料中各物相的化学组成,探讨了其显微结构的形成过程.研究结果表明,在电熔过程中锆英石分解产生的S iO2在... 以轻烧氧化镁和锆英石为原料,采用电熔法制备了MgO-ZrO2合成料,利用扫描电子显微镜和能谱仪对材料的显微结构进行了分析,计算了材料中各物相的化学组成,探讨了其显微结构的形成过程.研究结果表明,在电熔过程中锆英石分解产生的S iO2在晶界的低钙区域中以2MgO.S iO2的形式存在,而在高钙区域将生成MgO.S iO2.CaO玻璃相.基体中的MgO和杂质中的CaO将进入ZrO2晶格中形成(MgO+CaO)ZrO2固溶体,该固溶体在降温过程中会析出MgO,并在其晶粒周围形成富镁的2MgO.S iO2相. 展开更多
关键词 电熔MgO-ZrO2 轻烧氧化镁 锆英石 显微结构
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基于U2-Net和CBAM融合注意力的双模态睡眠分期研究 认领 引用 被引量：2
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作者 赵倩 李锦 +2 位作者 凤飞龙 强宁 胡静 《陕西师范大学学报（自然科学版）》 CAS CSCD 北大核心 2025年第1期1-11,共11页
针对当前自动睡眠分期方法存在的难点问题,提出了一种结合U2-Net和CBAM融合注意力对EEG-ECG双模态信号进行自动睡眠分期的方法。首先,采用MIT-BIH公开数据集中的EEG-ECG信号进行预处理;然后,利用添加了多尺度特征提取模块的U2-Ne... 针对当前自动睡眠分期方法存在的难点问题,提出了一种结合U2-Net和CBAM融合注意力对EEG-ECG双模态信号进行自动睡眠分期的方法。首先,采用MIT-BIH公开数据集中的EEG-ECG信号进行预处理;然后,利用添加了多尺度特征提取模块的U2-Net网络并行提取EEG和ECG中的波形特征;其次,利用CBAM融合注意力对全部特征进行权重分配;最后,使用Softmax激活函数对睡眠时期进行六分类。结果表明:基于U2-Net和CBAM融合注意力模型进行睡眠分期时,使用ECG单模态信号的六分类总体准确率为80.2%,F1分数为75.3%;使用EEG单模态信号的六分类总体准确率为85.8%,F1分数为81.7%;使用EEG-ECG双模态信号的六分类总体准确率为90.4%,F1分数为85.6%。提出的双模态睡眠分期模型是可行有效的,并且为自动睡眠分期提供了一种新的思路。 展开更多
关键词 自动睡眠分期 EEG-ECG双模态信号 U2-Net网络 CBAM融合注意力
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