Global exponential stability for nonautonomous cellular neural networks with delays

In this Letter, by utilizing Lyapunov functional method and Halanay inequalities, we analyze global exponential stability of nonautonomous cellular neural networks with delay. Several new sufficient conditions ensuring global exponential stability of the network are obtained. The results given here extend and improve the earlier publications. An example is given to demonstrate the effectiveness of the obtained results.     

硫酸海胆内容物多糖化学结构的质谱法研究

将海胆内容物硫酸多糖XB-3进行脱硫得到多糖XB-3D,分别对XB-3和XB-3D进行甲基化,对脱硫前后的部分甲基化糖进行气相色谱-质谱测定,通过质谱分析法得出XB-3和XB-3D的结构信息,包括其主链和支链的构成、连接方式、硫酸基取代位置和结构模型。     

Generation of multi-mode-entangled light

We propose a scheme to generate three-mode-entangled lights by means of the interaction between the four-level atoms and a three-mode cavity. We deduce the master equation of the cavity field and prove the existence of the three-mode entanglement by employing the criterion of positivity of partial transpose. We also discuss the effects of the initial atomic state and of the Rabi frequency of the classical pumping field on the entanglement and amplification.     

DNL-16:A new zeolitic layered silicate unraveled by three-dimensional electron diffraction

Two-dimensional(2D)zeolitic layered silicates(ZLSs)are drawing increasing attention since they have large external surface areas,easy convenience for further pillaring or exfoliating for desirable properties,and even promising candidates for constructing novel three-dimensional(3D)zeolites[1,2].From the structural point of view,basic building units SiO4 in ZLSs are interconnected through sharing the bridging oxygen atoms.     

同源细胞膜包覆智能释药纳米粒用于肝癌靶向治疗

近年来,纳米药物递送系统在癌症治疗方面的应用受到广泛关注。 传统的纳米药物递送系统存在生物相容性差、靶向性缺乏、在肿瘤部位释药缓慢等问题。 本文设计制备了一种同源细胞膜(M)包覆、癌细胞还原微环境控制释药的脂质体纳米粒子(命名为P-ss-G/D/Sf@M)来递送肝癌治疗药物索拉非尼(Sf)用于肝癌的靶向治疗。 利用薄膜水化法结合静电吸附及过膜挤压法制备包覆细胞膜的空白(P-ss-G/D@M)及载药(P-ss-G/D/Sf@M)纳米粒子。 P-ss-G/D/Sf@M对Sf的载药量为7.2%,包封率为79.9%。 体外释药结果显示,P-ss-G/D/Sf@M在还原条件下会加快药物的释放,48 h时药物释放量达到65%以上,较非还原条件下释药量提高了25%。 体外细胞实验结果证明,包覆肝癌细胞膜的纳米粒子更易被肝癌细胞摄取,表现了对肝癌细胞的靶向性,同时在肿瘤细胞高浓度谷胱甘肽(GSH)还原环境作用下,纳米粒子中的二硫键断裂,迅速释放药物,与非还原敏感载药纳米粒子相比,显著抑制肝癌细胞生长,提高细胞凋亡率。 因此,本文制备的同源细胞膜包覆的智能释药载体有可能用于今后的癌症治疗中。     

Highly efficient Fe_xNi_(1-x)O_y/CP electrode prepared via simple soaking and heating treatments for electrocatalytic water oxidation

The oxygen evolution reaction(OER) is a key step in the overall water splitting process. Numerous electrocatalysts have been developed to lower the overpotential and accelerate the kinetics of the OER. In this work, a simple soaking and heating treatment was used to form a stable and efficient Fe_xNi_(1-x)O_y/CP electrode. The electrode combined nickel and iron oxides on a commercial carbon paper were used for electrocatalytic water oxidation. The best Fe_xNi_(1-x)O_y/CP electrode(Ni/Fe = 15/1) displayed a current density of 10 mA/cm~2 at a low overpotential of 290 mV in 0.1 M KOH solution with a Tafel slope of 52 mV/dec.A higher current density of ~50 mA/cm~2 at the same overpotential and a lower Tafel slope of 43 mV/dec was obtained for this electrode in 1.0 M KOH solution. Excellent durability of the Fe_xNi_(1-x)O_y/CP electrode in 1.0 M KOH solution was confirmed under a high current density of 136 mA/cm~2 at an overpotential of 340 mV.     

室温MnO_x上O_3氧化脱除空气中甲醛

采用氧化还原法制备了MnOx催化剂,X射线衍射结果表明其主要为无定形结构.在甲醛和臭氧浓度分别为137和642mg/m3,相对湿度为56%(25oC),GHSV为2×105h-1条件下,MnOx催化剂上O3可将甲醛全部氧化为CO2,反应150min内甲醛转化率和CO2选择性一直保持在～100%.另外,当臭氧与甲醛的摩尔比约为2:3,即显著低于化学计量比时,CO2选择性仍可达～100%.采用傅里叶变换红外光谱仪在线分析了甲醛氧化反应产物,未检测到任何副产物,从而确认了MnOx催化剂上O3对甲醛的完全氧化.     

基于光化学传感器的二元羧酸阴离子识别研究进展

二元羧酸阴离子的识别与检测是当前超分子化学研究的热点领域之一。普遍使用的基于光学信号的二元羧酸阴离子受体主要有基于氢键作用的中性受体、有机阳离子型受体和金属配合物型受体三种类型。本文按照受体与二元羧酸阴离子作用类型的不同,介绍了近年来基于光化学传感器的二元羧酸阴离子的识别研究进展,并对相关研究进行了展望。     

Selective catalytic reduction of NO by C2H2 over Ce-Al2O3 catalyst with rate-determining step of NO oxidation

Ce-Al2O3 catalysts prepared by co-precipitation are investigated both in NO oxidation by O2 and in selective catalytic reduction of NO by C2H2(C 2 H 2-SCR).It is found that C2H2-SCR is initiated and controlled by NO oxidation to NO 2 over Al2O3.Ce loading on Al2O3 is almost inactive for NO oxidation below 350 C,since NO2 strongly adsorbs on cerium oxide,leading to the active sites being blocked,which was characterized by temperature-programmed desorption of NO and NO 2 and Fourier transform infrared spectroscopy after NO+O 2 coadsorption over the samples.However,in the case of C2H2-SCR,Ce loading on Al 2 O 3 significantly improves the reaction by accelerating the NO oxidation step in the temperature range of 250-450 C,since the nitrate species produced by NO 2 adsorption is an active intermediate required by C2H 2-SCR.