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

新型冠状病毒感染相关睡眠障碍的发病机制

国际麻醉学与复苏杂志 2024年第7期45卷 761-765页

作者：闫昌昊张宗旺潍坊医学院麻醉学院潍坊261053 聊城市人民医院麻醉科聊城252000

新型冠状病毒感染的全球大流行对人们的健康产生了广泛的影响,与其相关的睡眠问题也普遍存在。新型冠状病毒感染相关睡眠障碍与多种因素相关。文章复习相关文献,对感染新型冠状病毒后的炎症反应、对中枢神经系统的攻击以及神经递质的影... 详细信息

新型冠状病毒感染的全球大流行对人们的健康产生了广泛的影响,与其相关的睡眠问题也普遍存在。新型冠状病毒感染相关睡眠障碍与多种因素相关。文章复习相关文献,对感染新型冠状病毒后的炎症反应、对中枢神经系统的攻击以及神经递质的影响进行了重点阐述,以期待为新型冠状病毒感染相关睡眠障碍的防治提供参考依据。

关键词：新型冠状病毒感染睡眠障碍炎症反应中枢神经系统血脑屏障神经递质

Facile synthesis of metal-organic frameworks embedded in interconnected macroporous polymer as a dual acid-base bifunctional catalyst for efficient conversion of cellulose to 5-hydroxymethylfurfural

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第4期35卷 169-181页

作者： yanan Wei Yunlei Zhang Bing Li Wen Guan changhao yan Xin Li Yongsheng yan Institute of Green Chemistry and Chemical Technology School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212000China Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212000China

5-Hydroxymethylfurfural(5-HMF),as a key platform compound for the conversion of biomass to various biomass-derived chemicals and biofuels,has been attracted extensive *** this research,using Pickering high internal phase emulsions(Pickering HIPEs)as template and functional metal-organic frameworks(MOFs,UiO-66-SO;H and UiO-66-NH;)/Tween 85 as co-stabilizers to synthesis the dual acid-base bifunctional macroporous polymer catalyst by one-pot process,which has excellent catalytic activity in the cascade reaction of converting cellulose to *** effects of the emulsion parameters including the amount of surfactant(ranging from 0.5%to 2.0%(mass)),the internal phase volume fraction(ranging from 75%to 90%)and the acid/base Pickering particles mass ratio(ranging from 0:6 to 6:0)on the morphology and catalytic performance of solid catalyst were systematically *** results of catalytic experiments suggested that the connected large pore size of catalyst can effectively improve the cellulose conversion,and the synergistic effect of acid and base active sites can effectively improve the 5-HMF *** highest 5-HMF yield,about 40.5%,can be obtained by using polymer/MOFs composite as catalyst(Poly-P12,the pore size of(53.3±11.3)μm,the acid density of 1.99 mmol·g^(-1)and the base density of 1.13 mol·g^(-1))under the optimal reaction conditions(130℃,3 h).Herein,the polymer/MOFs composite with open-cell structure was prepared by the Pickering HIPEs templating method,which provided a favorable experimental basis and theoretical reference for achieving efficient production of high addedvalue product from abundant biomass.

关键词： Catalyst Biomass Hydrolysis 5-Hydroxymethylfurfural Pickering high internal phase emulsions templated polymer Acid-base bifunctional site

原油-CO_(2)相互作用机理分子动力学模拟研究

在线全文

学校读者我要写书评

暂无评论

油气藏评价与开发 2024年第1期14卷 26-34页

作者：李建山高浩鄢长灏王石头王亮亮中国石油长庆油田分公司油气工艺研究院陕西西安710018 中国石油长庆油田分公司低渗透油气田勘探开发国家工程实验室陕西西安710018 中国石油大学(华东)石油工程学院山东青岛266580

CO_(2)的众多驱油机理已经被广泛认同,但受油藏因素影响,不同油藏条件下CO_(2)驱的效果差异较大。因此,需要进一步深化研究CO_(2)与原油的微观相互作用机理,明确不同油藏条件下CO_(2)的驱油方式,最大限度挖潜CO_(2)驱的潜力。利用分子... 详细信息

CO_(2)的众多驱油机理已经被广泛认同,但受油藏因素影响,不同油藏条件下CO_(2)驱的效果差异较大。因此,需要进一步深化研究CO_(2)与原油的微观相互作用机理,明确不同油藏条件下CO_(2)的驱油方式,最大限度挖潜CO_(2)驱的潜力。利用分子动力学模拟方法研究了组分、温度、压力对油滴-CO_(2)相互作用的影响。求取动力学参数,量化表征油滴-CO_(2)间的相互作用,厘清了不同条件下二者的微观相互作用规律。模拟结果显示,色散力是主导CO_(2)-烷烃分子相互作用的主要作用能,二者相互作用主要包含两方面:一是CO_(2)分子克服烷烃分子间的位阻作用向油滴内部溶解扩散,二是CO_(2)分子对油滴外层分子的萃取吸引作用。随着烷烃分子链长减小、温度降低和压力增加,油滴溶解度参数和CO_(2)配位数增加,油滴外层分子的弯曲度减小,二者的相互作用增强。研究结果认为,在温度较低、压力较高的轻质和中轻质油藏中,应尽可能地实现CO_(2)混相驱和近混相驱,在温度较高、压力较低的中质和重质油藏中,应充分发挥CO_(2)非混相驱的溶解降黏、膨胀原油体积和补充能量的优势。研究结果能够为室内研究和现场实施CO_(2)驱油提供理论指导。

关键词： CO_(2)驱油微观作用机理分子动力学模拟色散能溶解扩散

Synthesis of SrAl_2O_4:Eu^(2+),Dy^(3+) phosphors by the coupling route of microemulsion with coprecipitation method

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第6期25卷 615-619页

作者： SUN yanbin QIU Guanming LI Xikun ZHANG Shengqu yan changhao ZHANG Xinyu School of Material and Metallurgy Northeast University Shenyang 110006 China College of Materials Science and Engineering Jilin University Changchun 130026 China School of Materials and Chemical Engineering Changchun University of Science and Technology Changchun 130022 China Nanjing University of Technology Nanjing 210009 China Shenyang University of Science and Technology Shenyang 110168 China Department of Chemistly and Chemical Engineering Yangzhou University Yangzhou 225002 China

Nano-sized SrAl2O4：Eu^2＋,Dy^3＋ phosphors with good monodispersity and narrow size distribution were synthesized by the coupling of water-in-oil （W/O） microemulsion with coprecipitation method. The phase composition, morphology, crystallinity, excitation spectra, emission spectra, and afterglow decay of SrAl2O4：Eu^2＋,Dy^3＋ nanophosphors were measured. It was found that the amount of surfactant that was used had an important effect on the shape and average size of the phosphor particles. SrAl204 phase of the phosphors showed an increase with the increase in calcination temperature. When the calcination temperature reached 1150℃, the fine crystal of SrAl2O4 was formed and the long afterglow luminescence could be obviously observed. In comparison with the samples prepared by the high-temperature solid-state method, the calcination temperature showed an obvious decrease and a dear blue shift occurred in the excitation and emission spectra of the sample. The afterglow time could be more than 8 h.

关键词： long afterglow phosphors microemulsion coprecipitafion rare earths

Feature-Scale Simulations of Particulate Slurry Flows in Chemical Mechanical Polishing by Smoothed Particle Hydrodynamics

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2014年第10期16卷 1389-1418页

作者： Dong Wang Sihong Shao changhao yan Wei Cai Xuan Zeng State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 201203China. LMAM and School of Mathematical Sciences Peking UniversityBeijing 100871China. Department of Mathematics and Statistics University of North Carolina at CharlotteCharlotteNC 28223USA.

In this paper,the mechanisms of material removal in chemical mechanical polishing(CMP)processes are investigated in detail by the smoothed particle hydrodynamics(SPH)*** feature-scale behaviours of slurry flow,rough pad,wafer defects,moving solid boundaries,slurry-abrasive interactions,and abrasive collisions are modelled and *** with previous work on CMP simulations,our simulations incorporate more realistic physical aspects of the CMP process,especially the effect of abrasive concentration in the slurry *** preliminary results on slurry flow in CMP provide microscopic insights on the experimental data of the relation between the removal rate and abrasive concentration and demonstrate that SPH is a suitable method for the research of CMP processes.

关键词： Chemical mechanical polishing smoothed particle hydrodynamics particulate flow rough pad wafer defects abrasive concentration.

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

粉煤灰陶粒轻质混凝土声屏障性能试验研究

硅酸盐通报 2024年第5期43卷 1897-1905页

作者：庚利民杜红秀聂小青周星宇闫常昊雷一彬太原理工大学土木工程学院太原030024 山西省建筑科学研究院集团有限公司太原030024 太原理工大学建筑学院太原030024

混凝土是一种应用广泛、可使用多种固废制备的建筑材料。本研究将粉煤灰陶粒作为轻骨料,水泥-粉煤灰-硅灰-煤系偏高岭土作为复合胶凝材料,制备用作声屏障的粉煤灰陶粒轻质混凝土,并对其力学性能、吸声性能和抗碳化性能进行试验研究。结... 详细信息

混凝土是一种应用广泛、可使用多种固废制备的建筑材料。本研究将粉煤灰陶粒作为轻骨料,水泥-粉煤灰-硅灰-煤系偏高岭土作为复合胶凝材料,制备用作声屏障的粉煤灰陶粒轻质混凝土,并对其力学性能、吸声性能和抗碳化性能进行试验研究。结果表明:当粉煤灰-硅灰-煤系偏高岭土总掺量为胶凝材料总质量的10%时,试样的力学性能、抗碳化性能有所提高,吸声性能有所降低;随着粉煤灰-硅灰-煤系偏高岭土掺量进一步增加,试样的力学性能、抗碳化性能有所降低,吸声性能有所提高。1500 Hz及以下频率吸声系数变化幅度较小,2000 Hz时吸声效果最好,试样的平均吸声系数在0.44~0.58,降噪系数在0.74~0.89。

关键词：粉煤灰陶粒轻质混凝土力学性能吸声系数降噪系数抗碳化

维普期刊数据库博看期刊

MTCR-CR Routing Strategy for Connection-Oriented Routing over Satellite Networks

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第5期21卷 280-296页

作者： Li changhao Sun Xue yan Lei Cao Suzhi The University of Chinese Academy of Sciences Beijing 100094China Key Laboratory of Space Utilization Chinese Academy of SciencesBeijing 100094China Technology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing 100094China

The high-speed movement of satellites makes it not feasible to directly apply the mature routing scheme on the ground to the satellite ***-DVTR in the snapshot-based connectionoriented routing strategy is one of the representative solutions,but it still has room for improvement in terms of routing *** this paper,we propose an improved scheme for connection-oriented routing strategy named the Minimal Topology Change Routing based on Collaborative Rules(MTCR-CR).The MTCR-CR uses continuous time static topology snapshots based on satellite status to search for intersatellite link(ISL)construction solutions that meet the minimum number of topology changes to avoid route *** simulation results in Beidou-3 show that compared with DT-DVTR,MTCR-CR reduces the number of routing changes by about 92%,the number of path changes caused by routing changes is about38%,and the rerouting time is reduced by approximately 47%.At the same time,in order to show our algorithm more comprehensively,the same experimental index test was also carried out on the Globalstar satellite constellation.

关键词： ISL routing stability satellite networks satellite routing dynamic strategy

单分散Eu^(3+)-co-PMMA共聚荧光微球的制备及性能研究

在线全文

学校读者我要写书评

暂无评论

材料导报 2016年第18期30卷 6-9,15页

作者：严长浩李云严欣张明扬州大学化学化工学院扬州225002

通过乳液聚合的方法,将具有双键的稀土铕配合物与甲基丙烯酸甲酯单体共聚,得到具有稀土特征荧光的单分散微球。采用红外光谱仪(IR)、扫描电子显微镜(SEM)、X射线粉末衍射仪(XRD)对产物的形貌进行分析,结果表明共聚微球粒径均一性较好;... 详细信息

通过乳液聚合的方法,将具有双键的稀土铕配合物与甲基丙烯酸甲酯单体共聚,得到具有稀土特征荧光的单分散微球。采用红外光谱仪(IR)、扫描电子显微镜(SEM)、X射线粉末衍射仪(XRD)对产物的形貌进行分析,结果表明共聚微球粒径均一性较好;借助同步热分析(STA)研究了产物的热性能,紫外光谱仪(UV)和荧光光谱仪测试了产物的光学性能,结果表明共聚微球具有稀土(Eu^(3+))的特征光学性质,并且通过改变稀土配合物含量,可以改变共聚微球的荧光强度。

关键词：单分散稀土配合物荧光微球

不同转速永磁同步电机非晶合金和硅钢选材分析

在线全文

学校读者我要写书评

暂无评论

电工钢 2024年第1期6卷 52-58页

作者：颜昌昊樊庆林马德稷胡海洋王丽慧曾鹿滨裴瑞琳沈阳工业大学辽宁沈阳110870 苏州英磁新能源科技有限公司江苏苏州215000

介绍了非晶材料和硅钢的磁性能,并在高速电机分别采用这两种材料进行仿真,根据仿真结果对比分析了两种材料于电机效率以及不同转速下的铁损差值。并研究了不同转速下电机非晶材料和硅钢铁损的变化规律。结果表明,在高速电机中非晶材料... 详细信息

介绍了非晶材料和硅钢的磁性能,并在高速电机分别采用这两种材料进行仿真,根据仿真结果对比分析了两种材料于电机效率以及不同转速下的铁损差值。并研究了不同转速下电机非晶材料和硅钢铁损的变化规律。结果表明,在高速电机中非晶材料优势明显,为不同转速工况的电机提供选材建议。

关键词：高速电机非晶合金铁损永磁同步电机