基于光纤自相位调制多波长全光再生的色散管理优化

针对基于光纤自相位调制效应的多波长全光再生系统,分析了光纤平均色散对再生器品质因子改进量的影响,提出一种色散管理优化方法.由于波长间色散差异会导致再生系统性能的稳定性下降,通过选择色散补偿光纤和单模光纤的长度,使其合成的色散曲线与各波长分别达到最优再生性能时对应的色散曲线近似拟合,同时保证该色散曲线落在性能满意度高的色散区域,然后调整信号输入功率和滤波器的偏移量,可有效改善多波长再生性能的稳定性,实现再生器的色散管理优化.     

Regeneration of surface roughness by the Langevin equation using stochastic analysis on AFM image of a carbon fiber

A new method was developed using AFM images of a fiber surface to regenerate the surface roughness in 3D geometry, such as the cylindrical shape of a “model” fiber. The Langevin equation was used to derive the fluctuations of a carbon fiber surface image. The equation contains two quantities, D⁽¹⁾ (h) and D⁽²⁾ (h) which in physics represent drift and diffusion coefficients. Knowing this coefficient and adding a proper noise function, a similar surface of larger dimension with the same statistical properties of the initial data was created. The generated surface was mapped into cylindrical coordinates, then a mesh generated. The resulting reconstructed surface, input over the geometry of a cylindrical shape, can be implemented for finite element analysis of a single fiber surrounded by matrix and generalized to a many fiber model.     

异质结型AgBr/CuO光催化剂的合成、 光催化活性及再生

采用沉淀法制备了具有p-n异质结结构的AgBr/CuO可见光催化剂, 对其结构进行了表征, 通过甲基橙溶液的降解率评价了AgBr/CuO的光催化活性, 并通过活性物种测试及能带结构分析推测了其光催化机理, 采用3%(质量分数)溴水对使用后的AgBr/CuO进行了再生处理. 结果表明, 在可见光照射下, 0.1 g AgBr/CuO光催化剂30 min对甲基橙溶液(初始浓度为15 mg/L)的降解率高达92%, 远高于同等条件下的AgBr. AgBr/CuO光催化活性提高的原因是AgBr与CuO的复合一方面使催化剂的禁带宽度变宽, 提高了光生电子与光生空穴的氧化还原能力; 另一方面, 在两者之间形成了p-n型异质结结构, 有利于光生电子的转移及光生电子与空穴的分离. 采用绿色环保的溴水再生法可显著恢复催化剂的光催化活性.     

Semiconductor optical amplifier used as regenerator for degraded differential phase-shift keying signals

Phase and amplitude regeneration are necessary for degraded differential phase-shift keying communication systems.This paper proposes a regenerator based on semiconductor optical amplifier for differential phase-shift keying signals.The key regeneration mechanism is theoretically analysed.The effectiveness of semiconductor optical amplifier based regenerator is demonstrated by comparing the bit error rate and eye diagrams before and after regeneration for 40-Gbit/s differential phase-shift keying 1080-km transmission systems.The results show that regeneration effects are very well.Bit error rate is less than 10 12 with the regenerator.     

磷酸盐洗脱液再生IMAC-Cu蛋白质芯片

使用扫描电子显微镜（SEM）和蛋白质芯片检测系统考察了磷酸盐洗脱液pH值和竞争洗脱剂对IMAC-Cu蛋白质芯片再生的影响。 结果表明,随着磷酸盐洗脱液pH值降低,芯片所吸附的蛋白质越容易被去除,但对芯片表面化学结构的破坏也随之加剧。 在洗脱液中加入竞争洗脱剂乙二胺四乙酸（EDTA）或甘氨酸（Gly）可有效改善蛋白质的洗脱效果。 当磷酸盐洗脱液pH=6.5、竞争洗脱剂为0.02 mol/L EDTA、洗脱时间72 h时,芯片的再生效果最佳。     

有机-无机复合骨修复材料

本文对近5年来有机/无机复合骨修复材料研究领域的进展进行了综述,根据材料组分的特点分析其在生物相容性、生物降解性、生物活性以及力学性能等方面的优缺点,同时探讨了目前骨修复材料领域存在的问题,并对今后人工骨替代材料的发展趋势作出了展望。     

基于均匀设计优化深山草莓花瓣离体培养及植株再生体系

应用均匀设计法对深山草莓花瓣诱导愈伤组织和愈伤组织再分化芽苗的主要因子和水平进行了探讨.结果表明,深山草莓花瓣愈伤组织诱导的适宜培养基为LS+TDZ 2.06 mg.L-1+2,4-D 0.60 mg.L-1,诱导率为98%;愈伤组织再分化芽苗的适宜培养基为1/2 LS+TDZ 2.30 mg.L-1+NAA 0.10 mg.L-1+KT1.30 mg.L-1,分化率为96.3%.炼苗移栽后观察植株的形态、花、果及生长等特征,以筛选具有优良性状的株系.     

Ultra-sensitive Detecting OPs-Isocarbophos Using Photoinduced Regeneration of Aptamer-based Electrochemical Sensors

Residues related to organophosphorus pesticides (OPs) may be hazardous to food and environmental safety. Isocarbophos (ICP) is one of the most highly toxic OPs that had been banned in China and strictly limited in many other countries for use on vegetables and fruits. However, illegal use often occurs in agricultural production due to its good control effect. Developing a sensitive method is an urgent need to determine trace ICP. Herein, an electrochemical aptasensor was fabricated for ICP detection, which combines the advantages of the high affinity of aptamer with photo-triggered azobenzene to realize the sensor's regeneration. In this work, the aptamer was labeled with ferrocene group (Fc) at the 3′-end and modified on the surface of the electrode as a recognition element for specific detection of ICP. Two azobenzene groups were inserted at the 5′-end of the aptamer. Upon ultraviolet light irradiation, the configuration of azobenzene altered from trans-to-cis, and two units of ICP dissociated with aptamer by the unfolding of its hairpin structure to achieve the sensor's regeneration. Based on this strategy, the current response recorded of the aptasensor increases with the increasing of ICP concentration. The differential pulse voltammogram (DPV) signals are linear with the logarithm of ICP concentration in a range from 10 pM to 10 μM. The limit of detection is 3 pM (S/N=3). After 6 times of regeneration, the signal intensity for ICP could keep over 95 % to the first time of detection. The aptasensor was also successfully applied to the ICP analysis in tomato to validate stability and applicability, with an average recovery rate of 76.2 %–119.3 % and a relative standard deviation (RSD) of 1.8 %–10.7 %. To the best of our knowledge, this study was the first time using a simple incubation procedure, to realize sensitive and reversible detection of ICP, meanwhile which expected to be applied to the ICP's toxicological research.     

Osteoconductive biocompatible 3D-printed composites of poly-d,l-lactide filled with nanocrystalline cellulose modified by poly(glutamic acid)

Three dimensional composite matrices based on poly-d,l-lactide filled with 5 or 10 wt% of nanocrystalline cellulose modified by poly(glutamic acid) were produced using pre- optimized 3D printing technique. The composites demonstrated good biocompatibility and significantly improved osteoconductive properties compared with the matrix without filler or the one filled with neat nanocrystalline cellulose.     

Autologous Materials in Regenerative Dentistry: Harvested Bone,Platelet Concentrates and Dentin Derivates

The jawbone is a peculiar type of bone tissue, unique for its histological, anatomical and physiological characteristics. Therefore, a defect in the maxilla or in the mandible, because of pathological sequelae is difficult to prevent and to restore. Several biomaterials have been and are currently being developed to respond to the demands of regenerative medicine. A specific group of biomaterials used in regenerative dentistry is represented by the autologous materials. Platelet concentrates harvested bone and dentin derivates are indeed used in an attempt to minimise the alveolar resorption or in vertical ridge augmentation procedures or in sinus lift interventions. The aim of this review is to examine the properties of the above-listed materials, to compare them and to indicate eventual clinical applications.