In∶Mn∶Fe∶LiNbO_3晶体非挥发性全息存储

在Mn∶Fe∶LiNbO3(Mn∶Fe∶LN)中掺进不同摩尔分数In2O3,用提拉法生长In∶Mn∶Fe∶LN晶体。测试了晶体的红外光谱,发现:3%In∶Mn∶Fe∶LN晶体OH-吸收峰位置移到3 506 cm-1。用光斑畸变法测试晶体抗光致散射能力表明:In∶Mn∶Fe∶LN晶体抗光致散射能力比Mn∶Fe∶LN晶体提高1~2个数量级。探讨了In∶Mn∶Fe∶LN晶体OH-吸收峰移动和抗光致散射能力增强的机理。以He Ne激光作记录光,高压汞灯紫外光作开关光,In∶Mn∶Fe∶LN晶体中一种杂质Fe充当较浅能级,另一种杂质Mn充当较深能级,以Mn∶Fe∶LN和1%In∶Mn∶Fe∶LN晶体作为存储介质实现非挥发性存储。用双光子固定法测量了In∶Mn∶Fe∶LN晶体的二波耦合衍射效率。研究了In∶Mn∶Fe∶LN晶体的双光子全息存储机理。     

Zn2+掺杂Mn:Fe:LiNbo3晶体的特性和非挥发性全息存储

在铌酸锂LiNbo3(LN)中掺入摩尔分数为0.1%MnO,质量分数为0.03?2O3和摩尔分数分别为1%,3%和7%ZnO,用提拉法生长Zn:Mn:Fe:LN晶体.测试了晶体的红外光谱,发现7%Zn:Mn:Fe:LN晶体 OH-吸收峰位置移到3 529 cm-1.用光斑畸变法测量晶体的抗光损伤能力.结果表明:7%Zn:Mn:Fe:LN晶体的抗光损伤能力比Ma:Fe:LN晶体提高1个数量级以上.探讨了Zn:Mn:Fe:LN晶体OH-吸收峰移动和抗光致散射能力增强的机理.以He-Ne激光作记录光,高压汞灯紫外光作开关光,用双光子固定法测量了Zn:Mn:Fe:LN晶体的二波耦合衍射效率,以Mn:Fe:LN和1%Zn:Mn:Fe:LN晶体作为存储介质实现了非挥发性存储. 体.测试了晶体的红外光谱,发现7%Zn:Mn:Fe:LN晶体 OH-吸收峰位置移到3 529 cm-1.用光斑畸变法测量晶体的抗光损伤能力.结果表明:7%Zn:Mn:Fe:LN晶体的抗光损伤能力比Ma:Fe:LN晶体提高1个数量级以上.探讨了Zn:Mn:Fe:LN晶体OH-吸收峰移动和抗光致散射能力增强的机理.以He-Ne激光作记录光,高压汞灯 外光     

In:Ce:Mn:LiNbO3晶体的全息存储性能

原料采用固液同成分配比,在LiNbO3（LN）晶体中掺入质量分数为0．1％CeO2和0．015％MnCO3,摩尔分数分别为0,1％,2％和3％的In,用提拉法生长In：Ce ：Mn ：LN晶体。测试了In ：Ce ：Mn ：LN晶体的红外透射光谱和抗光损伤能力。结果表明：3％In ：Ce ：Mn ：LN晶体的OH振动吸收峰紫移到3508cm^-1位置;其抗光损伤能力比Ce ：Mn ：LiNgO3晶体提高2个数量级以上。利用二波耦合光路测试晶体的写入时间（τw）、擦除时间（τc）和衍射效率（η）,计算晶体的动态范围（M^#）,研究In^3＋掺量对Ce ：Mn ：LN晶体光折变性能的影响。结果表明：In ：Ce ：Mn ：LN晶体是比Ce ：Mn ：LN晶体综合性能更好的全息存储材料。     

不同Li/Nb摩尔比In:Fe:LiNbO3晶体的生长及其光学性能

在LiNbO3(LN)中掺摩尔分数为1%的In和掺质量分数为0.03%的Fe,用提拉法技术生长具有不同n(Li)/n(Nb)[n(Li)/n(Nb)=0.94,1.05,1.20,1.38]的In:Fe:LN晶体.测试不同n(Li)/n(Nb)的In:Fe:LN晶体的吸收光谱、抗光致散射能力和指数增益系数,并计算晶体的有效载流子浓度.结果表明:晶体样品随着n(Li)/n(Nb)增加,吸收光谱的吸收边发生紫移,抗光致散射能力增加,指数增益系数和有效载流子浓度增大.采用n(Li)/n(Nb)=1.38的In:Fe:LN晶体作记录介质,n(Li)/n(Nb)=1.05的In:Fe:LN晶体作位相共轭镜进行全息关联存储实验.实验表明:存储系统具有实时处理,成像质量好,信噪比高和能反复使用等优点.     

In:Fe:Cu:LiNbO_3晶体光损伤阈值和非挥发性全息存储

在LiNbO3(LN)中掺入摩尔分数分别为0,0.25%,1.5%,1.75%的In2O3、质量分数为0.1%的Fe2O3和0.05%的CuO,用提拉法生长了系列 In:Fe:Cu:LiNbO3(In:Fe:Cu:LN)晶体.采用Sanarmont补偿法和透射光束图像畸变法,测试In:Fe:Cu:LN晶体的光损伤阈值,基于Scalar表达式,讨论了晶 体光损阈值变化的机理.结果表明:3%In:0.1%Fe:0.05%Cu:LN晶体光损伤阈值比LN晶体高2个数量级,3%In3+达到阈值浓度.采用0.1%Fe:0.05%Cu:LN 晶体和0.5%In:0.1%Fe:0.05%Cu:LN晶体作为存储介质,Fe2+/Fe3+作为浅能级,Cu+/Cu2+作为深能级,以氪离了激光(蓝光)作开关光,氦-氖激光(红光)作为记录光,完成双光子固定非挥发性存储实验.实验表明:0.5%1n:0.1%Fe:0.05%Cu:LN晶体存储记录速度比Mn:Fe:LN晶体提高1个数量级.     

不同Li/Nb摩尔比In∶Fe∶LiNbO_3晶体的生长及其光学性能

在Li NbO3(LN)中掺摩尔分数为1%的In和掺质量分数为0.03%的Fe,用提拉法技术生长具有不同n(Li)/n(Nb)[n(Li)/n(Nb)=0.94,1.05,1.20,1.38]的In∶Fe∶LN晶体。测试不同n(Li)/n(Nb)的In∶Fe∶LN晶体的吸收光谱、抗光致散射能力和指数增益系数,并计算晶体的有效载流子浓度。结果表明晶体样品随着n(Li)/n(Nb)增加,吸收光谱的吸收边发生紫移,抗光致散射能力增加,指数增益系数和有效载流子浓度增大。采用n(Li)/n(Nb)=1.38的In∶Fe∶LN晶体作记录介质,n(Li)/n(Nb)=1.05的In∶Fe∶LN晶体作位相共轭镜进行全息关联存储实验。实验表明存储系统具有实时处理,成像质量好,信噪比高和能反复使用等优点。     

Mg:Mn:Fe:LiNbO_3晶体永久性全息存储研究

在Mn∶Fe∶LiNbO3中掺进 6%MgO(摩尔分数 )采用Czochralski技术生长Mg∶Mn∶Fe∶LiNbO3晶体。晶体在Li2 CO3粉末中经 5 0 0℃下2 4h的还原处理和在Nb2 O3粉末中经 110 0℃下 10h的氧化处理。晶体的测试结果表明 ,Mg∶Mn∶Fe∶LiNbO3晶体的抗光散射能力比Mn∶Fe∶LiNbO3晶体提高 1个数量级以上。采用He-Ne激光作为记录光 ,紫外光作选通光 ,用双光子法测试Mg∶Mn∶Fe∶LiNbO3晶体二波耦合衍射效率。双光子稳态衍射效率为 η0 =5 2 % ,固定衍射效率为 ηG=2 9% ,记录时间为 40min ,记录速度比Mn∶Fe∶LiNbO3晶体提高 3倍。对记录光、选通光的作用和三掺杂Mg∶Mn∶Fe∶LiNbO3晶体双光子全息存储的机理进行研究     

Mg：Mn：Fe：LiNbO3晶体永久性全息存储研究

在Mn：Fe：LiNbO3中掺进6％MgO(康尔分数)采用Czochralski技术生长Mg：Mn：Fe：LiNbO3晶体。晶体在Li2CO3粉末中经500℃下24h的还原处理和在Nb2O3粉末中经1100℃下10h的氧化处理。晶体的测试结果表明，Mg：Mn：Fe：LiNbO3晶体的抗光散射能力比Mn：Fe：LiNbO3晶体提高1个数量级以上。采用He—Ne激光作为记录光，紫外光作选通光，用双光子法测试Mg：Mn：Fe：LiNbO3晶体二波耦合衍射效率。双光子稳态衍射效率为ηo＝52％，固定衍射效率为ηG=29％，记录时间为40min，记录速度比Mn：Fe：LiNbO3晶体提高3倍。对记录光、选通光的作用和三掺杂Mg：Mn：Fe：LiNbO3晶体双光子全息存储的机理进行研究。     

In:Fe:LiNbO3晶体的生长及其在全息关联存储中的应用

用提拉法生长1％（摩尔分数,下同）In ：Fe ：LiNbO3（LN）,2％In ：Fe ：LN,3％In ：Fe ：LN和Fe ：LN晶体,配料中掺入0．03％（质量分数）Fe2O3。采用光斑畸变法测试晶体的光损伤阈值。结果表明：1％In ：Fe ：LN和2％In ：Fe ：LN晶体的光损伤阈值比Fe ：LN晶体高1个数量级以上。3％In ：Fe ：LN晶体的光折变阈值比Fe ：LN晶体高2个数量级以上。晶体的位相共轭效应测试结果表明,1％In ：Fe ：LN晶体的位相共轭反射率（R1=185％）高于3％In ：Fe ：LN晶体（R3=120％）。以3％In ：Fe ：LN晶体作为存储元件,1％In ：Fe ：LN晶体作为位相共轭镜．进行全息关联存储实验．其再现图像清晰完整,噪音小。     

Mg∶Mn∶Fe∶LiNbO3晶体永久性全息存储研究

在Mn∶Fe∶LiNbO3中掺进6%MgO(摩尔分数)采用Czochralski技术生长Mg∶Mn∶Fe∶LiNbO3晶体.晶体在Li2CO3粉末中经500 ℃下24 h的还原处理和在Nb2O3粉末中经1 100 ℃下10 h的氧化处理.晶体的测试结果表明,Mg∶Mn∶Fe∶LiNbO3晶体的抗光散射能力比Mn∶Fe∶LiNbO3晶体提高1个数量级以上.采用He-Ne激光作为记录光, 紫外光作选通光, 用双光子法测试Mg∶Mn∶Fe∶LiNbO3晶体二波耦合衍射效率.双光子稳态衍射效率为η0=52%, 固定衍射效率为ηG=29%, 记录时间为40 min, 记录速度比Mn∶Fe∶LiNbO3晶体提高3倍.对记录光、选通光的作用和三掺杂Mg∶Mn∶Fe∶LiNbO3晶体双光子全息存储的机理进行研究.     

Pullulan: A versatile coating agent for superparamagnetic iron oxide nanoparticles

Ultrasmall superparamagnetic iron oxide (Fe₃O₄) nanoparticles coated by biocompatible pullulan (Pu‐USPIO) with sizes below 10 nm and having a magnetite core and a hydrophilic outer shell of pullulan were prepared. The formed Pu‐USPIOs were thoroughly characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, atomic force microscopy, and small‐angle X‐ray scattering experiments. The content of magnetic nanoparticles embedded into the pullulan matrix was determined by thermogravimetric analysis. Vibrating sample magnetometry analysis was used to evaluate the magnetic properties of the Pu‐USPIO samples. Because of the presence of pullulan, these nanoparticles could be conditioned in many versatile forms, from a clear solution to magnetic films, for potential applications, including magnetic hyperthermia mediators. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 42926.     

Poly(sulphopropylbetaines): 1. Synthesis and characterization

The synthesis of aromatic and aliphatic poly(sulphopropylbetaines) is described within the series of vinylpyridines and tertiary amino-methacrylates. Two complementary strategies were used: (a) preparation and free radical polymerization in aqueous solution (60°C, 4,4'-azobiscyanovaleric acid) of the monomers; (b) heterogeneous quaternization of preformed poly(vinylpyridines) and poly(tertiary amino-methacrylates) by 1,3-propanesultone in propylene carbonate or tetramethylene sulphone solution (120°C). The high molecular weight poly (zwitterions) ($\text{10}{}^5\text{<}\text{M}\text{?}{}_{\mathrm{W}}\text{< 5 × 10}{}^6$) were characterized by ultra-violet and ¹H nuclear magnetic resonance spectroscopy, and their water affinity at 20°C was estimated by water vapour absorption measurements.     

SiAlON–epoxy nanocomposite coatings: Corrosion and wear behavior

In this study, epoxy powder as a matrix was combined with different contents of silicon–aluminum–oxygen–nitrogen (SiAlON) nanoparticles using a planetary ball mill. Pure epoxy and nanocomposite powders were applied on the surface of plain carbon steel components by the electrostatic spraying method. Curing of the coatings was done in an oven or microwave for the appropriate time. The coating structure and morphology of the SiAlON nanoparticles were studied by scanning electron microscopy and transmission electron microscopy, respectively. The corrosion properties of the coatings were assessed by immersion, Tafel polarization, and electrochemical impedance spectroscopy tests in 3.5% NaCl solution. The results show that addition of 10 wt % SiAlON nanoparticles markedly increases the corrosion resistance of epoxy coatings. Thus, it can be inferred that the corrosion rate of these coatings is 15 to 18 times lower than that of pure epoxy samples and 8 to 11 times lower than coatings with 20 wt % SiAlON. The higher corrosion resistance of nanocomposite coatings can be attributed to the barrier properties of SiAlON nanoparticles. The tribological performance of the coatings was studied with the pin‐on‐disk test. The results of wear testing show that the samples containing 10 wt % SiAlON provide about five times more wear resistance than pure ones and about two times more than coatings with 20 wt % SiAlON. However, the coefficient of friction for nanocomposite coatings is reduced about 50% compared to the pure sample. Also, the curing process in either regime (oven or microwave) has the same effect on the corrosion and wear properties, and the coatings are completely crosslinked. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43855.     

Color and Sound: Physical and Psychophysical Relations*

Many artists and scientists have been concerned, throughout time, with the correspondences between color and sound. Numerous studies on the subject have been written. There are approaches based on intuition as well as approaches based on psychology, psychophysics, physics, and physiology The classical comparison relies on the fact that the stimuli for the sensations of pitch in sound and hue in color are mainly determined by the wavelength of the auditory energy and the visible energy. both taken as undulatory phenomena. On this basis. a comparison is usually drawn between the chromatic scale of sounds and the hue circle. This criterion has been followed to such extent to relate a sound of specific frequency with a determined spectral color. The comparison can be expanded and refined by considering the other variables of sound and color. too. This article relates luminosity of color with loudness of sound. saturation of color with timbre of sound, and size of color with duration of sound. There are psychological and physical arguments to support such a comparison. © 1994 John Wiley & Sons, Inc.     

Ag‐nanocomposite based on carboxymethylcellulose for humidity detection: Green synthesis and sensing performances

A novel highly sensitive Ag‐nanocomposite for humidity detection has been successfully prepared. Initially, cellulose isolated from Tunisian palm date petiole was converted to carboxymethyl cellulose (CMC) as biomatrix under heterogeneous conditions. The synthesized product was thoroughly characterized by means of FT‐IR spectroscopy, viscosity analysis, and high performance size exclusion chromatography multiangle laser light scattering. CMC was used as reducing and stabilizing agent to prepare CMC‐stabilized silver nanoparticles via a rapid green method. The bioreduction of silver ions under different experimental conditions, including Ag⁺ concentration and pH, was investigated. Optimal experimental conditions provided a long‐term stable colloidal suspension and well‐dispersed spherical shape Ag NPs with a size ranging from 13 to 28 nm. Ag‐nanocomposite coated quartz microbalance crystal was used as sensitive layer for humidity detection. A comparative study showed that the immobilized metallic nanostructures greatly reduced changes in visco‐elastic properties, increased surface area as well as surface local charge density of the CMC. Consequently, sensor performances were greatly enhanced: better stability even at higher relative humidity (RH), good reproducibility and linearity (11–98% RH), low hysteresis characteristics, and rapid response and recovery times (14 and 6 s, respectively) were obtained. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43686.     

Quality control in the polypropylene manufacturing process: An efficient,data‐driven approach

In the propylene polymerization process, the melt index (MI), as a critical quality variable in determining the product specification, cannot be measured in real time. What we already know is that MI is influenced by a large number of process variables, such as the process temperature, pressure, and level of liquid, and a large amount of their data are routinely recorded by the distributed control system. An alternative data‐driven model was explored to online predict the MI, where the least squares support vector machine was responsible for establishing the complicated nonlinear relationship between the difficult‐to‐measure quality variable MI and those easy‐to‐measure process variables, whereas the independent component analysis and particle swarm optimization technique were structurally integrated into the model to tune the best values of the model parameters. Furthermore, an online correction strategy was specially devised to update the modeling data and adjust the model configuration parameters via adaptive behavior. The effectiveness of the designed data‐driven approach was illustrated by the inference of the MI in a real polypropylene manufacturing plant, and we achieved a root mean square error of 0.0320 and a standard deviation of 0.0288 on the testing dataset. This proved the good prediction accuracy and validity of the proposed data‐driven approach. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41312.     

Rheological behavior of cellulose nanocrystal suspension: Influence of concentration and aspect ratio

The steady and dynamic rheological behaviors of two cellulose nanocrystal (CNC) suspensions were investigated over a wide range of concentrations. The viscosity, storage and loss modules increased with increasing CNC concentration, and both CNC suspensions showed three regions in a viscosity‐concentration graph. The two critical concentrations depended on the aspect ratio and corresponded to the overlap and gelation concentration. Because of the higher aspect ratio, switchgrass CNC suspension transitioned into a biphasic state and formed a hydrogel at lower concentrations than those of cotton CNC suspensions. Furthermore, the complex viscosities of both CNC suspensions were higher than their steady viscosities; therefore, neither CNC suspension followed the Cox–Merz rule, which may be attributed to the existence of a liquid crystal domain in each suspension. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40525.     

Beyond waste: Transforming wheat straw into oxygen and UV-resistant cellulose films

Regenerated cellulose membrane is a biomaterial obtained by activating, dissolving, solidifying, and regenerating cellulose powder using solvents of different polarities. It has the characteristics of high oxygen resistance and high strength. However, its low water vapor barrier and single function limit its application. In order to improve the water resistance of regenerated cellulose membranes and endow them with UV resistance, lignin was extracted from waste wheat straw using formic acid method. The extracted formic acid lignin (FAL) was added to the cellulose solution to prepare a series of regenerated lignocellulosic membranes (RC-FAL) with different lignin contents. The results indicate that lignin can not only improve the water vapor barrier, tensile strength, and water resistance of the film, but also enhance the oxygen barrier and UV absorption of the film. Compared with pure cellulose film, the contact angle of lignocellulose film can be increased by 66.2%, the UV absorption rate can reach 100%, and the oxygen transmission coefficient has no significant effect. In this paper, a new kind of biological packaging material with high oxygen resistance, strong ultraviolet absorption, and water resistance was prepared by recycling waste wheat straw, it has a broad application prospect in the industrial production of packaging materials.     

Pyrolysis oil substituted epoxy resin: Improved ratio optimization and crosslinking efficiency

The objective of this study was to determine the compatibility of whole pyrolysis oil (PO) of pine as a substitute for the phenolic component of epoxy resins (ER). Pyrolysis oil‐based epoxy resin (POBER) was synthesized by modification of EPON828 ER with PO at various mixing ratios (1 : 3–1 : 8, PO:EPON828, w/w). Acetone extraction determined that a ratio of 1 : 7–1 : 8 resulted in a fully reacted thermoset, leaving neither PO nor EPON828 in a significantly unreacted state. Dynamic mechanical analysis (DMA) revealed that a ratio of 1 : 8 produced the highest storage modulus (E’); in addition, it was determined that this ratio provided a superior glass transition temperature (Tg) of 120°C and crosslinking density of 1891 mol/m³. FTIR spectra concluded that the reaction between the EPON828 and PO was complete at the 1 : 8 ratio, citing the removal of hydroxyl and epoxide peaks within the cured product. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42239.