Hierarchical porous metal-organic frameworks/polymer microparticles for enhanced catalytic degradation of organic contaminants

This work reports on a simple microfluidic strategy to controllably fabricate uniform polymeric microparticles containing hierarchical porous structures integrated with highly accessible catalytic metal organic frameworks for efficient degradation of organic contaminants. Monodisperse (W1/O)/W2 emulsion droplets generated from microfluidics are used as templates for the microparticle synthesis. The emulsion droplets contain tiny water microdroplets from homogenization and water nanodroplets from diffusion-induced swollen micelles as the dual pore-forming templates, and Fe-based metal-organic framework nanorods as the nanocatalysts. The obtained microparticles possess interconnected hierarchical porous structures decorated with highly accessible Fe-based metal-organic framework nanorods for enhanced degradation of organic contaminants via a heterogeneous Fenton-like reaction. Such a degradation performance is highlighted by using these microparticles for efficient degradation of rhodamine B in hydrogen peroxide solution. This work provides a simple and general strategy to flexibly combine hierarchical porous structures and catalytic metal-organic frameworks to engineer advanced microparticles for water decontamination.     

Error-tolerability enhancement via bit inversion and median filtering for single-bit errors in image processing circuits

Microsystem Technologies - Error-tolerance has been proposed as a new method to increase effective yield of a system. The basic idea is that faulty chips might be still acceptable as long as their...     

基于运行时模型的多样化云资源管理方法

多样化的受管资源和不断变化的管理需求,使得云管理面临很大的难度和复杂度.面对一个新的特定的管理需求,管理员往往是在已有管理软件的基础上进行二次开发,通过管理功能的获取和组织来构造新的管理系统.然而,由于缺乏通用的方法,二次开发的难度和复杂度依然很大.为了能够根据管理需求快速定制、集成、扩展已有的管理软件,提出一种基于运行时模型的多样化云资源管理方法.首先,在系统管理接口的基础上构造不同受管资源的运行时模型;其次,通过对不同的运行时模型进行合并,来构造包含所有目标受管资源的组合模型;最后,通过组合模型到用户特定模型的转换,来满足特定的管理需求.在OpenStack与Hyperic两款独立管理软件的基础上,实现了基于运行时模型的虚拟机软、硬件资源统一管理系统,验证了方法的可行性和有效性.     

Media Independent Mobility Management for D2D Communications over Heterogeneous Networks (HetNets)

The rapid growth of traffic demand and innovation of mobile networks have pushed the current communication infrastructure to provide a tight integration of different wireless technologies. On the one hand, all user connections are expected to be heterogeneous in future networks and thus an intelligent mobility management is essential to satisfy the requirements of lower latency, less power consumptions and last but not least possible uninterrupted ongoing session when a User Equipment (UE) moves across network boundaries. On the other hand, Device-to-Device (D2D) communication as a revolutionary technology to enhance network performance has shown a great potential in dominating future communication market. Consequently, in this paper, we investigate the mobility management problem for D2D communications in heterogeneous networks. We leverage on IEEE 802.21 Media Independent Service (MIS) and propose a new framework, so-called enhanced version of IEEE 802.21 MIS that supports D2D communication (E-MIS-D2D) to enhance D2D mobility experience over heterogeneous networks. The E-MIS-D2D is a network assisted and initiated architecture, in which a load-aware mode selection algorithm is also proposed for selecting the transmission mode between D2D and non-D2D modes. Through extensive simulations, we validate that the proposed method outperforms the existing methods in terms of packet loss ratio, average throughput, latency, bandwidth usage and load rate of eNB.

     

超高效液相色谱-电喷雾串联质谱法同时测定生菜中四环素类抗生素及其代谢产物

目的建立超高效液相色谱-电喷雾串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)测定生菜中9种四环素类抗生素及其代谢产物的残留分析方法。方法生菜样品采用EDTA-Mcllvaine缓冲液与乙腈混合溶液提取,HLB固相萃取小柱净化,色谱分离选择ACQUITY UPLC BEH C18色谱柱,以乙腈和0.2%甲酸水溶液为流动相进行梯度洗脱,得到的分离效果较好。质谱采用电喷雾正离子电离、多反应监测模式检测。结果在0.01~0.5 mg/L范围内线性相关系数r2均大于0.99。仪器检出限为1.085~15.780μg/kg,方法的定量限为3.617~42.526μg/kg。在4个添加水平0.01、0.05、0.1和0.5 mg/kg下,除脱水四环素和差向脱水四环素(其回收率40%)外,其余四环素类抗生素及代谢产物在蔬菜中的添加回收率在为63.4%~101.3%,相对标准偏差为2.52%~12.56%。结论该方法灵敏度高,净化效果好,可以用于蔬菜中四环素类抗生素及其代谢产物的残留分析。     

EAOMDV-MIMC: A Multipath Routing Protocol for Multi-Interface Multi-Channel Mobile Ad-Hoc Networks

Multipath routing has been proposed to improve performance of mobile ad-hoc networks (MANETs). However, due to: (1) nodes lacking of network interface and (2) route coupling, using multiple paths concurrently in conventional single channel MANETs rarely exhibit performance gain. To improve performance, an ad-hoc routing protocol (and its extension) that utilizes multiple homogeneous network interface is proposed in this paper. Unlike other related multi-channel routing protocols, channels are not assigned. Instead, nodes are allowed to make use of all available channels they are tuned to. In the base protocol, nodes estimate channel conditions by monitoring their network interface queues and distribute data packets to different channels and next-hops according to their conditions. In the extended protocol, estimated channel condition at a node is further propagated to neighboring nodes by piggybacking channel condition information in data packets. With overhearing, other nodes can retrieve this information to make better next-hop selections. Extensive simulation studies show that our protocol outperforms other related multi-channel routing protocols.     

运行时软件体系结构的建模与维护

运行时体系结构是系统运行时刻的一个动态、结构化的抽象,描述系统当前的组成成分、各成分的状态和配置以及不同成分之间的关系.运行时体系结构与目标系统间具有动态的因果关联,即系统的变化及时体现在体系结构上,而对体系结构的修改及时影响当前系统.运行时体系结构允许开发者以读写体系结构的方式实现系统的监测和调整,是体系结构层次系统动态适应与在线演化的基础.构造运行时体系结构的关键是针对不同的目标系统和体系结构风格实现合适的基础设施,以维护二者之间的因果关联.由于目标系统和体系结构的多样性以及因果关联维护逻辑的复杂性,这一构造过程往往过于繁琐、易错、难以复用和维护.提出一种模型驱动的运行时体系结构构造方法.开发者只需针对目标系统、体系结构以及两者之间的关系分别进行建模,根据这些模型,支撑框架自动构造合法而高效的运行时体系结构基础设施.基于MOF 和QVT 标准建模语言定义了一组运行时体系结构建模语言,并基于通用的模型与系统间同步技术实现了相应的支撑框架.一系列实例研究表明,该方法具有广泛的适用性,并显著提高了运行时体系结构构造过程的效率与可复用性.     

Antibacterial activity of poloxamer-modified montmorillonite clay against E. coli

The aim of this study was to understand the antibacterial activity of poloxamer-modified montmorillonite (MMT) clay and to elucidate its possible mechanism. Modified MMT clay was first examined for characterizations of morphology, composition, crystal structure, thermal behavior, and Fourier transform infrared (FTIR) and X-ray photoelectron spectrometry (XPS), exhibiting a weight fraction of approximately 24% of poloxamer, and mainly consisting of Ca, Mg, Al, Si, and O elements in the clay. Pathogenic Gram-negative bacteria, Escherichia coli (E. coli), were chosen as the antibacterial evaluation indicator of this clay by determining the minimum inhibitory concentration (MIC) in nutrient broth (NB). The amount of cations releasing into NB was also analyzed via inductively coupled plasma mass spectrometry (ICP-MS). Poloxamer-modified MMT clay with a concentration of 2310 ppm was found to depress the growth of E. coli and exhibited a high calcium concentration of approximately 101 ppm releasing into NB. However, it was found that after being used once in the antibacterial test, the modified MMT clay did not retain any antibacterial activity in fresh NB; this is believed to be a result of the loss of poloxamer and decreased numbers of calcium ions incorporated into the used MMT clay, thus lowering bactericide induction, as indicated by the FTIR, XPS and ICP results.