大烘缸及其水压试验

阐述了大烘缸的功能、结构组成及水压试验等。     

介质阻挡放电电离质谱法快速筛查水产品中孔雀石绿及其代谢物

建立了采用介质阻挡放电电离质谱（DBDI-MS/MS）技术对水产品中孔雀石绿（MG）及其代谢物隐色孔雀石绿（LMG）进行快速筛查的方法。样品经提取净化后,在氦气流量为3 L/min、离子源温度为230℃的DBDI离子源条件下,正离子模式下采用多反应监测（MRM）进行质谱检测。在此条件下,MG和LMG在1~20 μg/L范围内,相关系数r值分别为0.9951、0.9939,线性关系良好,MG和LMG的检出限均为1 μg/kg,样品加标回收率为61.8%~78.4%。该方法样品前处理简便,无需液相色谱分离,耗时短,适用大批量水产品中孔雀石绿非法添加的快速筛查。     

Preparation and in vitro characterization of crack-free mesoporous titania films

Crack-free mesoporous titania films (MTFs) on Ti6Al4V demonstrated potential application for implanting and bone regeneration materials in the future. The MTFs were prepared on Ti6Al4V substrate by an evaporation-induced self-assembly (EISA) process. The BET surface area, pore volume, and pore size of the MTFs samples were calculated to be 190 m²/g, 0.31 cm³/g, and 4.8 nm, respectively. The apatite-forming ability of the MTFs was evaluated by immersing them in simulated body fluid (SBF). After immersion in SBF for 5 days, bone-like apatite was induced on the surface of the MTFs. With increasing immersion time, the apatite would continue to grow and cover the surface of the MTFs. The apatite induced by MTFs contains Mg and Na ions, carbonated moieties and nano-network structure. In this work, preliminary investigation of the MG63 cell proliferation on the surface of the MTFs was also conducted. The cell experiment indicated that the MTFs possessed good biocompatibility and can thus provide a surface suitable for MG63 cell proliferation. The effects of surface properties and mesostructure on inducing apatite and cell proliferation were also discussed.     

Continuous transesterification of biodiesel in a helicoidal reactor using recycled oil

The main problem with biodiesel is the high cost of oils made from oleaginous crops. For this reason, various raw materials have been analysed with a view to reducing production costs and obtaining a product that can compete with the price of petrodiesel. Recycled oil is one of the most promising alternatives in the production of biodiesel because not only is the cheapest raw material but it also avoids the expense of treating the oil as a residue.Another way to reduce costs is to make the process more economical. Conventional technology uses sodium hydroxide as the basic catalyst and large-scale batch reactors, whose mechanical agitation requires high energy consumption due to residence times of at least 60 min and temperatures of 60 °C.In this paper we use a recycled pretreated oil to compare conventional transesterification with continuous transesterification in a tubular reactor. In this reactor the reactants (oil, methanol and sodium hydroxide) flow through a helicoidal tube submerged in a heating bath at 60 °C. The reactor has five outlets distributed non-uniformly to enable samples to be taken at different reaction times. This is to reduce the reaction time and avoid the need for mechanical agitation. With the aim of improving the quality of the biodiesel obtained, we varied the helicoidal system by incorporating a static micromixer and supplying energy in the form of ultrasound from the heating bath. This reactor produced biodiesel and glycerine at compositions roughly equal to those obtained in the batch process (89% FAME content at 75 min) but did so continuously (2.5 mL/min) and just 13 min after the reactants were integrated in a single line using a T device. Both the oil and the biodiesel were characterized and analysed in accordance with European standard UNE EN14214 for biodiesel.     

Megaco/H.248协议的分析和研究

Megaco/H.248协议是由IETF和ITU-T最近共同研究提出的一项新标准,它是PSTN网络与IP网络之间无缝地实现各种业务和应用的多媒体标准的又一里程碑。此协议扩展了媒体网关控制,使其包含了一个独立于传输的连接模型,支持诸如多媒体会议等的高级服务,并支持各个国家的操作。本文对Megaco/H.248特征进行了描述。     

IP电话发展新动向

介绍了NTT公司为参与到IP电话领域而进行的可行性论证、公司内部IP电话实验以及面向商业用户而推出的三种VoIP服务。对新的IP电话网从呼叫控制、通话建立、QoS和编译码、计费方面进行了介绍，并对IP国际电话、呼叫中心及新推出的服务进行了说明。     

MG750/1815-GWD型交流电牵引采煤机的研制

介绍了新型MG750/1815-GWD型交流变频电牵引采煤机的技术要点,经使用表明:我国开发的大采高采煤机使用效果良好。     

MG400/920-WD采煤机的改进

介绍了MG40 0 /92 0 -WD采煤机的使用性能 ,指出了它的独到之处 ,同时也对实际使用中出现的问题进行了分析 ,对采煤机的截割部、行走部、电控部进行改进     

Considering uncertainty in the optimal energy management of renewable micro-grids including storage devices

This paper proposes a new probabilistic framework based on 2m Point Estimate Method (2m PEM) to consider the uncertainties in the optimal energy management of the Micro Girds (MGs) including different renewable power sources like Photovoltaics (PVs), Wind Turbine (WT), Micro Turbine (MT), Fuel Cell (FC) as well as storage devices. The proposed probabilistic framework requires 2m runs of the deterministic framework to consider the uncertainty of m uncertain variables in the terms of the first three moments of the relevant probability density functions. Therefore, the uncertainty regarding the load demand forecasting error, grid bid changes and WT and PV output power variations are considered concurrently. Investigating the MG problem with uncertainty in a 24 h time interval with several equality and inequality constraints requires a powerful optimization technique which could escape from the local optima as well as premature convergence. Consequently, a novel self adaptive optimization algorithm based on θ-Particle Swarm Optimization (θ-PSO) algorithm is proposed to explore the total search space globally. The θ-PSO algorithm uses the phase angle vectors to update the velocity/position of particles such that faster and more stable convergence is achieved. In addition, the proposed self adaptive modification method consists of three sub-modification methods which will let the particles choosel the modification method which best fits their current situation. The feasibility and satisfying performance of the proposed method is tested on a typical grid-connected MG as the case study.     

Comparison about effects of Sr,Zr and Ce additions on as cast microstructure and mechanical properties of Mg–3·8Zn–2·2Ca (wt-%) magnesium alloy

Abstract

The effects of Sr, Zr and Ce additions on the as cast microstructure and mechanical properties of Mg–3·8Zn–2·2Ca (wt-%) magnesium alloy are investigated and compared. The results indicate that adding 0·1 wt-%Sr, 0·6 wt-%Zr or 1·0 wt-%Ce can effectively refine the grains of the alloy, and the refinement efficiency of Zr addition is relatively high, followed by the additions of Ce and Sr respectively. In addition, adding 0·1 wt-%Sr, 0·6 wt-%Zr or 1·0 wt-%Ce can improve the tensile properties of the alloy, and the improvement of Zr addition is relatively high, followed by the additions of Ce and Sr respectively. However, the effects of adding 0·1 wt-%Sr, 0·6 wt-%Zr and 1·0 wt-%Ce on the creep properties of the alloy are different. Adding 0·1 wt-%Sr or 0·6 wt-%Zr result in a decrease of creep properties. Oppositely, a significant improvement of creep properties can be obtained by adding 1·0 wt-%Ce.