检索结果-南通市图书馆

胶束辅助的酞菁给体-碳纳米管受体超分子自组装及光诱导长寿命电荷分离态

在线全文

学校读者我要写书评

暂无评论

高等学校化学学报 2012年第4期33卷 806-812页

作者：邵小娜张先付河北科技师范学院理化学院秦皇岛066004 mpc technologies HamiltonONCanada L8S 3H4

利用十二烷基硫酸钠(SDS)阴离子胶束能够稳定分散单壁碳纳米管(SWCNT)和解聚富集四磺酸锌酞菁(ZnPcS4)的能力,组装了ZnPcS4-SWCNT的电子给体-受体对来模拟光合作用的原初电子转移过程.用稳态和时间分辨荧光法研究了相应的给体-受体分子... 详细信息

利用十二烷基硫酸钠(SDS)阴离子胶束能够稳定分散单壁碳纳米管(SWCNT)和解聚富集四磺酸锌酞菁(ZnPcS4)的能力,组装了ZnPcS4-SWCNT的电子给体-受体对来模拟光合作用的原初电子转移过程.用稳态和时间分辨荧光法研究了相应的给体-受体分子间和分子内的光诱导电子转移速率,用激光闪光光解技术检测了生成的电荷分离态.ZnPcS4-SWCNT的电子给体-受体组装体在707 nm处出现了基态特征吸收峰,但是复合体不产生荧光,这主要归因于有效的分子内光诱导电子转移过程.瞬态吸收光谱检测到相应的离子对,动力学衰减结果表明,电荷分离态的寿命长达42μs.这一长寿命电荷分离态的形成,主要是因为ZnPcS4是良电子给体(低氧化电位),SWCNT是好的电子受体,使得三重态电子转移能够发生,生成三重态电荷分离态.

关键词：光诱导电子转移电荷分离态电子给体-受体四磺酸锌酞菁单壁碳纳米管

在线全文

学校读者我要写书评

暂无评论

苝分子低聚体的形成及其光谱性质

物理化学学报 2012年第2期28卷 283-289页

作者：刘丽敏张先付河北科技师范学院理化学院河北秦皇岛066004 mpc technologies HamiltonONCanada L8S 3H4

探讨了苝分子低聚体的形成条件和影响因素,这些低聚体与晶核形成紧密相关.用荧光光谱和吸收光谱法研究了不同的水含量和苝浓度对聚集的影响,低聚体属于具有光活性的J型,能发红光.计算得到低聚体的聚集数为9,平衡常数数量级较大.

关键词：苝聚集晶核聚集数平衡常数荧光

在线全文

学校读者我要写书评

暂无评论

水溶性酞菁类光敏剂的合成及其光谱性质研究

光谱学与光谱分析 2018年第12期38卷 3851-3856页

作者：鲁勖琳江苗苗孙丽娜徐明生张金源刘记张先付河北科技师范学院化学工程学院河北秦皇岛066604 mpc technologies HamiltonOntarioL8S 3H4Canada

以3-硝基邻苯二甲腈与3-巯基-1-丙磺酸钠为原料,在醋酸盐存在下通过四环化合成了三种带四个3-磺基丙基磺酰基的水溶性酞菁。利用紫外-可见吸收光谱,荧光光谱等对其光谱性质进行了测量,并计算了其荧光量子产率和单线态氧量子产率。引入... 详细信息

以3-硝基邻苯二甲腈与3-巯基-1-丙磺酸钠为原料,在醋酸盐存在下通过四环化合成了三种带四个3-磺基丙基磺酰基的水溶性酞菁。利用紫外-可见吸收光谱,荧光光谱等对其光谱性质进行了测量,并计算了其荧光量子产率和单线态氧量子产率。引入吸电子基团所合成的水溶性酞菁与Zn Pc相比,其荧光发射光谱的形状并未改变,但其最大荧光发射波长均发生10 nm以上的红移。三种水溶性酞菁中锌酞菁的荧光量子产率最高,铜酞菁的荧光量子产率最低;它们在水溶液中的荧光呈双指数衰减,这可归结为激发态质子化或去质子化的结果。单线态氧量子产率锌酞菁最大,空心酞菁次之,铜酞菁最小。光谱分析结果表明,合成的锌酞菁和空心酞菁具有高的单线态氧量子产率和高的光稳定性,有望用作光动力治疗和光免疫治疗的光敏剂。

关键词：水溶性酞菁光敏剂单线态氧光动力治疗光免疫治疗

在线全文

学校读者我要写书评

暂无评论

二卤代荧光素衍生物的荧光性能调控

无机化学学报 2014年第7期30卷 1582-1586页

作者：刘丽敏张先付河北科技师范学院应用光化学研究所秦皇岛066004 安徽理工大学化工学院淮南232001 mpc technologies HamiltonOntarioCanada L8S 3H4

用紫外可见吸收光谱、稳态/瞬态荧光光谱和单线态氧捕捉等方法分别测量了荧光素钠及4,5位-二卤代荧光素钠(FLX2,X=H,Cl,Br,I)的电子吸收光谱、荧光光谱、荧光量子效率(Φf)、荧光寿命(τf)和单线态氧量子产率(ΦΔ),并与荧光素钠的相应... 详细信息

用紫外可见吸收光谱、稳态/瞬态荧光光谱和单线态氧捕捉等方法分别测量了荧光素钠及4,5位-二卤代荧光素钠(FLX2,X=H,Cl,Br,I)的电子吸收光谱、荧光光谱、荧光量子效率(Φf)、荧光寿命(τf)和单线态氧量子产率(ΦΔ),并与荧光素钠的相应性质进行了比较。对应于X=H,Cl,Br,I,FLX2的Φf值分别为0.92、0.96、0.69、0.16;τf值分别为4.16、4.72、3.50、0.80 ns;ΦΔ值分别为0.003 4、0.049、0.30、0.68。随着氯、溴、碘原子量增大,相应的Φf和τf值并非顺序减小,ΦΔ值逐渐增大,只用重原子效应不能解释二卤代荧光素的荧光和光敏性质变化,而结合分子内光诱导电子转移就能较好的解释实验结果。

关键词：荧光素荧光单线态氧重原子效应光诱导电子转移

V2V Channel Characterization and Modeling for Underground Parking Garages

在线全文

学校读者我要写书评

暂无评论

China Communications 2019年第9期16卷 93-105页

作者： Mi Yang Bo Ai Ruisi He Liang Chen Xue Li Jianzhi Li Zhangdui Zhong The State Key Lab of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China Huawei technologies Xi’an 710075China

As an important part of the intelligent transportation system(ITS),vehicle-to-vehicle(V2V)communication will improve the safety and efficiency of the transportation system by realizing the information transmission between *** underground parking garage is a typical scenario in V2V communication,but as an indoor environment,it is different from the conventional outdoor road scenarios ***,the purpose of this paper is to analyze and model the V2V channel characteristics of an underground *** this paper,a novel channel measurement carried out in the underground garage is first *** that there are a lot of obstacles in an underground garage,the non-line-of-sight(NLoS)condition is taken into account during the ***,channel characteristic parameters,including large-scale fading,delay spread,and K-factor,are analyzed based on the measured *** addition,we also carry out channel angle of arrival analysis,show the distribution of azimuth of arrival(AOA)and elevation of arrival(EOA)of multipath components(mpc),and conduct a statistical analysis of the angular *** the process of analysis and modeling,we focus on the differences between line-of-sight(LoS)and NLoS *** analysis and conclusions presented in this paper will enrich the understanding of V2V channel and benefit the design of V2V communications.

关键词： V2V channel modeling channel characterization

Multifunctional magnesium organic framework-based photothermal and pH dual-responsive mouthguard for caries prevention and tooth self-healing promotion

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2023年第11期29卷 72-84页

作者： Qun Li Jinbiao Liu Huijie Liu Yue Sun Yingying Xu Kexin Wang Wenjing Huang Lan Liao Xiaolei Wang Affiliated Stomatological Hospital Nanchang UniversityNanchangJiangxi330006PR China National Engineering Research Center for Bioengineering Drugs and the technologies Institute of Translational MedicineNanchang UniversityNanchangJiangxi330088PR China College of Chemistry and Chemical Engineering Nanchang UniversityNanchangJiangxi330088PR China Jinggangshan University Ji’anJiangxi343009PR China Key Laboratory of Oral Biomedicine NanchangJiangxi330006PR China

Caries is considered to be the most prevalent non-communicable disease in humans, mainly deriving from acidogenic bacterial biofilm and resulting in the demineralization and decomposition of hard dental tissue. Herein, a composite responsive foam brace loaded with magnesium organic framework (mpc) is designed for caries prevention and tooth remineralization. mpc can intelligently release organic antibacterial molecules (gallic acid) and mineralized ions (Mg2+, Ca2+ and PO43􀀀 ) under acidic conditions (pH mpc can further enhance the destruction of bacterial biofilm by inhibiting virulence genes and destroying bacterial adhesion under near-infrared light irradiation (808 nm). More importantly, mpc can not only reverse the cariogenic environment at both pH and microbial levels, but also promote self-healing of demineralized teeth in terms of both the micro-structure and mechanical properties.

关键词： Photothermy pH-response Remineralization Caries prevention

Overview of Model Predictive Control for Induction Motor Drives

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

Chinese Journal of Electrical Engineering 2016年第1期2卷 62-76页

作者： Yongchang Zhang Bo Xia Haitao Yang Jose Rodriguez Inverter technologies Engineering Research Center of Beijing North China University of TechnologyBeijing100144China Universidad Andres Bello SantiagoChile.

Model predictive control(mpc)has attracted widespread attention in both academic and industry communities due to its merits of intuitive concept,quick dynamic response,multi-variable control,ability to handle various nonlinear constraints,and so *** is considered a powerful alternative to field oriented control(FOC)and direct torque control(DTC)in high performance AC motor *** to FOC,mpc eliminates the use of internal current control loops and modulation block,hence featuring very quick dynamic *** to DTC,mpc uses a cost function rather than a heuristic switching table to select the best voltage vector,producing better steady state *** spite of the merits above,mpc also presents some drawbacks such as high computational burden,nontrivial weighting factor tuning,high sampling frequency,variable switching frequency,model/parameter dependence and relatively high steady ripples in torque and stator *** paper presents the state of the art of mpc in high performance induction motor(IM)drives,and in particular the progress on solving the drawbacks of conventional ***,one of the improved mpc is compared to FOC to validate its *** is shown that the improved mpc has great potential in the future high performance AC motor drives.

关键词： Model predictive control(mpc) field oriented control(FOC) direct torque control(DTC) induction motor(IM).

A Voltage Sensorless Finite Control Set-Model Predictive Control for Three-Phase Voltage Source PWM Rectifiers

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

Chinese Journal of Electrical Engineering 2016年第2期2卷 52-59页

作者： Haitao Yang Yongchang Zhang Nong Zhang Paul D.Walker Jihao Gao School of Electrical Mechanicaland Mechatronic SystemsUniversity of TechnologySydneyNSW 2007Australia Inverter technologies Engineering Research Center of Beijing North China University of TechnologyBeijing100144China

In this paper,a grid voltage sensorless model predictive control is proposed and verified by simulation and experimental tests for a PWM *** presented method is simple and cost effective due to no need of modulator and voltage *** developed sliding mode voltage observer(SMVO)can theoretically track the grid voltage accurately without phase lag and magnitude *** on the proposed SMVO,the finite control set-model predictive control(FCS-mpc)is incorporated for power *** active power and reactive power are calculated and predicted using the measured current and the estimated grid voltage from the *** the predicated power for one-step delay compensation,the best voltage vector minimizing the tracking error is selected by *** whole algorithm is implemented in stationary frame without using Park's *** the simulation and experimental results validate the effectiveness of the proposed method.

关键词： Model predictive control(mpc) voltage sensorless control sliding mode observer three-phase voltage source rectifier(VSR).

Model Free Predictive Control for a Nonlinear Biological System with Intelligent Optimization Approach 25th

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

Model Free Predictive Control for a Nonlinear Biological Sys...