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

装配整体式梁柱节点的抗震性能对比研究

沈阳建筑大学学报（自然科学版） 2024年第5期40卷 839-847页

作者：刘卫东许攀熊张学伟霍涛蒙圣荣覃智泽上海理工大学环境与建筑学院上海200093 广西城市职业大学建筑工程学院广西崇左532100 中国建筑第八工程局有限公司上海200122

目的研究预制柱纵筋间距放大后装配整体式T型节点和十字型节点的抗震性能,为工程设计提供依据。方法对5个足尺梁柱节点试件进行低周往复荷载试验,通过对比各试件的滞回曲线、骨架曲线和位移延性等,研究了节点类型、柱纵筋间距和轴压... 详细信息

目的研究预制柱纵筋间距放大后装配整体式T型节点和十字型节点的抗震性能,为工程设计提供依据。方法对5个足尺梁柱节点试件进行低周往复荷载试验,通过对比各试件的滞回曲线、骨架曲线和位移延性等,研究了节点类型、柱纵筋间距和轴压比对梁柱节点抗震性能的影响。结果装配式节点均发生梁端弯曲破坏,预制柱和节点核心区未见明显破坏,破坏主要是预制梁端底部纵筋屈服和梁端底部混凝土压碎脱落;楼板加强了叠合梁的抗负弯矩能力,叠合梁上部现浇混凝土和预制混凝土交界面出现明显的水平剪切裂缝;柱纵筋间距放大后,与对比试件相比,T型节点的承载力提高了9.2%,十字型节点的承载力提高了1.3%。结论柱纵筋间距放大试件的延性和耗能能力与对比试件相差不大,柱纵筋间距放大对梁柱节点的抗震性能影响不大;十字型节点和T型节点位移延性系数相差不大。

关键词：装配混凝土节点抗震性能足尺试件低周往复荷载试验

维普期刊数据库博看期刊

Synthesis and Crystal Structure of (2S,2'S,4'R)-2-(1-hydroxy-1-ethylpropyl)-1-[(1'-p-tosyl-4'-hydroxypyrrolidin-2'-yl)methyl]pyrrolidine

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第10期25卷 1203-1208页

作者： FU Yu-qin DING Li-Na ZhANG Sheng-hong tao Jing-Chao ZhU Yu Department of Chemistry New Drug Research ＆ Development Center Zhengzhou University Zhengzhou 450052 China

The title compound （2S,2＇S,4＇R）-2-（1-hydroxy-1-ethylpropyl）-1-[（1＇-p-tosyl-4＇- hydroxypyrolidin-2＇-yl）methyl]pyrrolidine synthesized by using （2S,4R）-4-hydroxy-L-proline and L-proline as the main materials was characterized through IR, ^1h NMR, ^13C NMR and hRMS spectra as well as single-crystal X-ray diffraction analysis. There is one equivalent ethanol involved in the crystal （C23h40N2O5S, Mr = 456.63）. The crystal belongs to the triclinic system, space group P1, a = 6.5628（13）, b = 8.4228（17）, c = 11.957（2）°A, α= 80.54（3）,β= 83.19（3）, γ= 89.89（3）°, V= 647.3（2） °A^3, Z = 1, D, = 1.171 g/cm^3, λ（MoKα） = 0.71073°A,β = 0.158 mm^-1, F（000） = 248, the final R = 0.0465 and wR = 0.1336 for 1769 observed reflections with I〉 2σ（I）. The adjacent molecules of compound 5 are linked through intermolecular hydrogen bonds formed by the secondary hydroxy group of one molecule with the tertiary hydroxy group of another one, and the molecular chains are further linked by ethanol through two kinds of hydrogen bonds with two molecules from different chains respectively to form a supramolecular structure.

关键词： proline derivative chiral amino alcohol synthesis crystal structure

Effects of operating parameters on the flow field in slab continuous casting molds with narrow widths

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 238-248页

作者： tao Zhang Jian Yang Gang-jun Xu hong-jun Liu Jun-jun Zhou Wei qin State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China hunan Valin Lianyuan Iron&Steel Co. Ltd.Loudi 417000China

Computational simulations and high-temperature measurements of velocities near the surface of a mold were carried out by using the rod deflection method to study the effects of various operating parameters on the flow field in slab continuous casting(CC)molds with narrow widths for the production of automobile exposed *** agreement between the calculated results and measured subsurface velocities of liquid steel was obtained under different operating parameters of the CC *** simulation results reveal that the flow field in the horizontal plane located 50 mm from the meniscus can be used as the characteristic flow field to optimize the flow field of molten steel in the *** in casting speed can increase the subsurface velocity of molten steel and shift the position of the vortex core downward in the downward circulation *** flow field of liquid steel in a 1040 mm-wide slab CC mold can be improved by an Ar gas flow rate of 7 L·min^−1 and casting speed of 1.7 m·min^−*** the present experimental conditions,the double-roll flow pattern is generally stable at a submerged entry nozzle immersion depth of 170 mm.

关键词： flow field rod deflection method continuous casting narrow width numerical simulation operating parameters

highly efficient cobalt-based amorphous catalyst for peroxymonosulfate activation toward wastewater remediation

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第4期42卷 1160-1174页

作者： Xue-Chun Zhou Shuang-qin Chen Ming-Jie Zhou Mai Li Si Lan tao Feng School of Materials Science and Engineering Herbert Gleiter Institute of NanoscienceNanjing University of Science and TechnologyNanjing210094China School of Material Science and Engineering Nanjing Institute of TechnologyNanjing211167China

Metallic glasses(MGs)are rising novae in the catalytic field,due to their unique amorphous structure,large residual stress,and high density of low coordination ***,there is still an absence of suitable MGs'catalysts for advanced oxidation processes(AOPs)with peroxymonosulfate(PMS),the most efficient and promising wastewater remediation ***,the cobalt-based MG(Co-MG)with a nominal composition of Co_(67)Fe_(4)-Mo_(1.5)Si_(16.5)B_(11)(at%)was utilized as an activator of PMS for azo dye *** results demonstrated that the CoMG/PMS system had an order of magnitude higher efficiency on OrangeⅡ(OII)degradation than the Fe-MG/PMS *** fundamental study and field application,the effect of adding inorganic anions(Cl^(-),hCO_(3)^(-),h_(2)PO_(4)^(-),SO_(4)^(2-),NO_(3)^(-)),environmental factors,and cycle experiments on the catalytic properties of Co-MG were investigated emphatically to evaluate overall degradation *** has demonstrated that the Co-MG with more stability,better corrosion resistance and durability contrasted to *** addition,the excellent catalytic performance of Co-MG was analyzed based on the quenched experiment,electron paramagnetic resonance(EPR),and X-ray photoelectron spectroscopy(XPS)*** present results provide not only a new candidate but also shed light on exploring a new kind of AOPs system based on Co-MGs for wastewater treatment.

关键词： Co-based metallic glass ribbons Inorganic ions Stability Advanced oxidation process Peroxymonosulfate Azo dyes

Self-assembled sialyllactosyl probes with aggregation-enhanced properties for ratiometric detection and blocking of influenza viruses

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2019年第24期64卷 1902-1909页

作者： Wei-tao Dou Zhao-Yang qin Jun Li Dong-Ming Zhou Xiao-Peng he Key Laboratory for Advanced Materials Feringa Nobel Prize Scientist Joint Research CenterSchool of Chernistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Vaccine Research Center Key Laboratory of Molecular Virology&ImmunologyInstitut Pasteur of ShanghaiChinese Acadermy of SciencesShanghai 200031China

Infection and dissemination of influenza viruses(IVs) causes serious health concerns ***, effective tools for the accurate detection and blocking of IVs remain elusive. here, we develop a new sialyllactosyl probe with self-assembled core-shell structure for the ratiometric detection and blocking of IVs. N,N'-diaryl-dihydrodibenzo[a,c]phenazines were used to form the core structure by hydrophobic assembly in an aqueous solution with an aggregation-enhanced blue fluorescence ***, dicyanomethylene-4 h-pyran-based sialyllactosides were used for self-assembly with the core structure, producing the sialyllactosyl probe that emits a red fluorescence due to Forster resonance energy transfer. The probe developed has been proven to be available for(1) the fluorescence ratiometric detection of IVs through selective interaction with the sialyllactosyl-binding proteins on the virus surface,and(2) effectively blocking the invasion of human-infecting IVs towards host cells as accentuated by the sialyllactosides on the surface of the probes.

关键词： Vibration-induced emission Influenza viruses Ratiometric Fluorescence Glycoprobe

Incorporation of Fluorescent Carbon Quantum Dots into Metal-Organic Frameworks with Peroxidase-Mimicking Activity for high-Performance Ratiometric Fluorescent Biosensing

在线全文

学校读者我要写书评

暂无评论

Journal of Analysis and Testing 2023年第1期7卷 16-24页

作者： Qiuyu Ye tao Dai Jin Shen qin Xu Xiaoya hu Yun Shu School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

A new ratiometric fluorescent sensor based on the bifunctional carbon quantum dots(CQDs)@metal-organic framework(MOF)nanocomposite possessing peroxidase-mimicking catalytic and luminescent characteristics was developed for hydrogen peroxide(h_(2)O_(2))and cholesterol *** incorporation of fluorescent CQDs into the cavities of MIL-101(Fe)MOF with peroxidase-like activities endows the nanocomposite with bifunctional *** CQDs@MOF can oxidize o-phenylene-diamine to 2,3-diaminophenolazine by h_(2)O_(2)with yellow fluorescence(556 nm).Meantime,the intrinsic fluorescence signal(455 nm)of CQDs@MOF is inhibited due to the inner filter ***,the ratio of the fluorescent intensity is employed as the signal output to construct the h_(2)O_(2)ratiometric *** addition,the cholesterol can be determined by the ratiometric sensor with high *** addition,the total cholesterol in human serum is determined with high accuracy using our ratiometric *** ratiometric fluorescent platform based on the bifunctional CQDs@MOF provides new insights in the field of bio-sensing.

关键词： Carbon quantum dots Metal-organic framework Peroxidase-like activity Ratiometric fluorescent detection

针灸联合盆底肌康复训练对女性压力性尿失禁膀胱功能、尿动力学及盆底功能的回顾研究

在线全文

学校读者我要写书评

暂无评论

中华中医药学刊 2024年第2期42卷 55-59页

作者：赵曼丹陶莹黄飞麒廖凤儿荆永萍郭琴骆婕广东药科大学附属第一医院广东广州510080

目的观察针灸联合盆底肌康复训练对女性压力性尿失禁膀胱功能、尿动力学及盆底功能的影响。方法选择2021年6月—2022年6月于广东药科大学附属第一医院门诊康复治疗的150例女性轻中度压力性尿失禁(Stress Urinary Incontinence,SUI)患者... 详细信息

目的观察针灸联合盆底肌康复训练对女性压力性尿失禁膀胱功能、尿动力学及盆底功能的影响。方法选择2021年6月—2022年6月于广东药科大学附属第一医院门诊康复治疗的150例女性轻中度压力性尿失禁(Stress Urinary Incontinence,SUI)患者作为研究对象,采用随机数字表法将以上患者随机分为对照组和联合组,每组75例,对照组予以常规盆底肌康复训练,联合组在对照组基础上予以针灸治疗,连续干预2个疗程。观察并比较两组干预前后膀胱功能、尿动力学指标、盆底功能以及生活质量变化。结果对照组总有效率为80.00%(60/75),联合组总有效率为92.00%(69/75),相较于对照组,联合组的总有效率明显升高(Ph尿垫试验尿失禁量和24 h尿失禁次数均明显减少,差异具有统计学意义(Phral closure pressure,MUCP)以及最大尿流率(maximum flow rate,Qmax)等尿动力学指标水平无明显差异。干预2个疗程后,与对照组比较,联合组的上述指标水平均明显升高(P<0.01);联合组患者的阴道收缩压(vaginal squeezing pressure,VSP)和阴道静息压(resting pressure,VRP)水平相较于对照组均明显升高;且盆底肌力在0~2级者明显减少,而达到5级水平的患者数量明显增加,差异具有统计学意义(P<0.01,P<0.05)。治疗后,联合组患者的膀胱颈移动度和尿道旋转角度相较于对照组均明显降低(P<0.01)。干预前,两组患者的国际尿失禁咨询委员会问卷表(ICIQ-SF)和盆腔器官脱垂-尿失禁性生活问卷(PISQ-31)评分水平无明显差异。干预2个疗程后,与对照组比较,联合组的ICIQ-SF评分水平明显降低,而PISQ-31评分水平则明显升高40(P<0.01)。结论针刺配合盆底肌训练能够提高女性SUI的治疗效果,缓解尿失禁症状,有效调整膀胱功能,并改善尿动力学指标、改善盆底功能以及患者生活质量,临床疗效确切,适宜推广。

关键词：针灸盆底肌康复压力性尿失禁膀胱功能盆底功能

Microstructural evolution in Al–Zn–Mg–Cu–Sc–Zr alloys during short-time homogenization

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

International Journal of Minerals,Metallurgy and Materials 2015年第5期22卷 516-523页

作者： tao Liu Chun-nian he Gen Li Xin Meng Chun-sheng Shi Nai-qin Zhao Department of Materials Science and Engineering Tianjin University Tianjin Key Laboratory of Composite and Functional Materials Collaborative Innovation Center of Chemical Science and Engineering

Abstract： Microstructural evolution in a new kind of aluminum （A1） alloy with the chemical composition of AI-8.82Zn-2.08Mg- 0.80Cu-3.31Sc-0.3Zr was investigated. It is found that the secondary phase MgZn2 is completely dissolved into the matrix during a short homogenization treatment （470℃, 1 h）, while the primary phase A13（Sc,Zr） remains stable. This is due to Sc and Zr additions into the A1 al- loy, high Zn/Mg mass ratio, and low Cu content. The experimental findings fit well with the results calculated by the homogenization diffusion kinetics equation. The alloy shows an excellent mechanical performance after the short homogenization process followed by hot-extrusion and T6 treatment. Consequently, a good combination of low energy consumotion and favorable mechanical properties is obtained.

关键词： aluminum alloys microstructural evolution short-time ,homogcnization grain refinement

2型糖尿病患者发病年龄、病程、糖化血红蛋白与缺血性脑卒中发病风险的前瞻性队列研究

在线全文

学校读者我要写书评

暂无评论

中华流行病学杂志 2024年第4期45卷 498-505页

作者：范习康李梦瑶覃玉沈冲陆艳孙中明杨婕陶然周金意杭栋苏健江苏省疾病预防控制中心南京210009 南京医科大学公共卫生学院南京211166 苏州市疾病预防控制中心苏州215003 淮安市疾病预防控制中心淮安223001

目的分析江苏省2型糖尿病患者发病年龄、病程和糖化血红蛋白(hbA1c)与缺血性脑卒中(IS)发病风险的关联。方法研究对象来自江苏省社区糖尿病综合干预及应用研究,2013年12月至2014年1月开展基线调查,本研究随访数据截至2021年12月31日,剔... 详细信息

目的分析江苏省2型糖尿病患者发病年龄、病程和糖化血红蛋白(hbA1c)与缺血性脑卒中(IS)发病风险的关联。方法研究对象来自江苏省社区糖尿病综合干预及应用研究,2013年12月至2014年1月开展基线调查,本研究随访数据截至2021年12月31日,剔除基线诊断为脑卒中以及发病年龄、病程和hbA1c信息缺失的参与者后,最终共纳入17576名研究对象。采用Cox比例风险回归模型计算发病年龄、病程、hbA1c与IS发病的风险比(hR)值及其95%CI。结果研究对象中位随访时间8.02年,期间共登记IS新发病例2622名。多因素Cox比例风险回归分析显示,糖尿病发病年龄每延迟5年,IS发病风险降低5%(hR=0.95,95%CI:0.92~0.99),糖尿病病程每增加5年,IS发病风险增加5%(hR=1.05,95%CI:1.02~1.10),较高的hbA1c(每增加1个标准差:hR=1.17,95%CI:1.13~1.21)与IS发病风险增加相关。结论2型糖尿病患者较早的发病年龄、更长的病程和较高水平的hbA1c均与IS发病风险增加相关。

关键词：糖尿病,2型缺血性脑卒中前瞻性研究