提高Φ2.2 m×7.5 m矿渣磨产量和细度的措施

福建三明水泥厂矿渣和熟料易磨性不同,制约了 2.2 m×6.5m闭路水泥磨系统的产质量,导致产量低仅12 t/h;矿渣掺量低,仅7％;水泥强度低R28仅达47.0MPa。为此该厂增加了2台 2.2m×7.5m开流磨单独粉磨矿渣,实现熟料矿渣分别粉磨工艺。同时对 2_2m×6.5m矿渣磨进行结构改造和工艺操作参数调整。这样二套粉磨系统可根据熟料和矿渣的不同粉磨特性分别进行操作控制,工厂实现了高产高质,高矿渣掺量(达15％)和低成本生产。     

EVAPORATION FROM POROUS MEDIA: A CAPILLARY MODEL OF A PENETRATING FRONT

A capillary tube model was solved to investigate the influence of mass transfer coefficient, temperature, and front depth on the evaporation rate during the penetrating-front period of water-filled porous media dried in hot air. The results show that increasing the flow rate of the drying air is not so efficient as increasing the sample temperature. Due to attenuating diffusion rate, the rate of liquid front migration decreases with time. The calculations explain the falling rate period behavior of sandstone heated at 121°C. Trends depicted by the model may be useful for the design of heating conditions for drying processes.     

Understanding aluminum behaviour in aqueous alkaline solution using coupled techniques: Part I. Rotating ring-disk study

Rotating disk electrode (RDE) and rotating ring-disk electrode (RRDE) measurements have been undertaken to study the behaviour of pure aluminum electrodes in alkaline media. The measurements did consist of linear sweep voltammetry from anodic to cathodic potentials on 4N, 5N or 5N5-aluminum samples in 4 M aqueous potassium hydroxide solution. In the potential range studied (−0.7 V versus NHE to −2.5 V versus NHE) the aluminum undergoes oxidation/dissolution into aluminates anions at high electrode potential while it yields strong hydrogen evolution at low potentials. Thanks to the RRDE technique, we show that hydrogen starts to evolve from the aluminum electrode even above the open circuit potential. Also, the oxidation state of superficial aluminum varies according to the electrode potential: whereas non-conducting aluminum oxides are present above the open-circuit potential hindering hydrogen evolution reaction (HER), they tend to disappear below the ocp, due to the strong hydrogen evolution, following the probable porous oxide layer blow up induced by the hydrogen bubbles formation. In consequence at very low potential, HER occurs on bare aluminum, HER kinetics being much faster than on oxide-covered aluminum.     

Inverse solution for a biochemical heat source in a porous medium in the presence of natural convection

The inverse problem approach by conjugate gradient with adjoint equations is adapted to the context of a non-isothermal bioprocess, controlled by internal heat generation from microbial oxidation, as could be found in a composting reactor for instance, to determine the heat source from internal temperature measurements. The volumetric heat source is assumed proportional to the rate of consumption of a substrate by a biomass, as described by a Monod model. Computations are performed for Rayleigh numbers equal to 0.25 and 25, for a representative biochemical reaction under typical boundary conditions, for constant and temperature-dependent model parameters. The influence of noisy input data is also considered. It is found that good solutions can be obtained when heat release and diffusion occur over very different time scales. The variation of the model parameters with temperature must be taken into account, but single sensor solutions are possible at relatively small Rayleigh numbers when convection is present.     

Impacts of new technologies on media usage and social behaviour in domestic environments

Technological infrastructure at home is changing continuously and is becoming increasingly interconnected. Media devices, including the TV set, provide access to the Internet and offer manifold opportunities to consume media on demand. Additionally, personal devices, such as smartphones, also enable flexible consumption and sharing of media. Questions about how these technologies change the user's media usage and how these changes affect the social structure of a household, however, remain largely unanswered. In order to gain insight into the adoption of new technologies into daily routines, we explored these changes in respect of people's media usage in a qualitative long-term Living Lab study. We will present findings regarding personal routines, flexible integration of new devices into existing practices, influences on households as social systems and related issues in device access and collective use. We will highlight potentials and conflicts regarding device shifts and roles; restrictions in device access; social influences in the living room; and individual changes in media consumption.     

Mixing in Wave Processes Propagating in Gas Mixtures (Review)

A review is made of uptodate investigations in the field of physicomathematical modeling of mixing of solid particles with highvelocity gas flows arising under the action on shock waves, compression waves, and expansion waves on unstable dust deposits on the boundaries of channels or plates and in cavities, as well as on free clouds of particles. In particular, experiments in shock tubes with particles initially located in cavities and on surfaces are described. The experimental data presented in the form of distributions of particle concentrations at various points of space above the unstable layer, pressure distributions on the lower wall of the shock tube, etc., are used for verification of proposed mathematical models in regimes of single particles, interacting continua, and turbulent diffusion. An analysis of experimental and numerical data shows that the models considered sometimes allow adequate identification of the wave structure of motion of the mixture and the field of parameters inside and outside the layer.     

Expectations and Experiences With MyLabourParty: From Right to Know to Right to Participate?

Social media are often argued to change political communication, decreasing the distance between politicians and citizens, and increasing citizens' influence on policymaking. This paper presents findings from a study of how the Norwegian Labour Party uses social media, focusing on the community platform MyLabourParty. Interviews with politicians and a survey with citizens as respondents were conducted to examine the experiences of online political discussions. Findings show that citizens and politicians expect MyLabourParty to strengthen citizen participation. Yet, citizens still experience communication asymmetry and politicians may find it challenging to participate to the extent citizens expect. Means for bridging the gap between expectations and experiences are called for, in particular redefinition of the offering, changes of user‐practices, and system improvements.     

组合填料-膜生物反应器处理生活污水生产性试验

在一体式膜生物反应器（MBR）中加入组合填料，对北京某国际公寓的生活污水处理进行了生产性试验。试验表明，在进水水温15～22℃，pH值6．5～7．2，曝气气水体积比9～10：1，COD198．6～563．5mg／L，NH4-N20．5～55．3mg／L，反应器中混合液悬浮固体浓度（MLSS）维持在5200～7800mg／L时，MBR对水中的COD、NH4^＋-N平均去除率分别为90．6％、68．7％，出水中检测不出SS和大肠菌群，浊度小于1NTU，水质满足CJ2511-89《生活杂用水水质标准》。在相同条件下，未加填料反应器MLSS平均值必须维持在12000mg／L以上时才能达到类似处理效果。由于反应器中加入组合填料，降低了MLSS的浓度，减少了膜污染，在膜通量不变情况下，化学清洗周期可延长35～40d。     

基于iebook的电子书播放外部视频功能的实现

Exe类型电子书制作软件集成文字内容和小图片非常容易,效果也很不错,但是对集成高品质的音视频、数码照片等大容量数据文件却无能为力。通过对iebook超级精灵自带模板以及Exe电子书文件的深入分析,把flash技术、流媒体对象和file协议有机结合,实现动态加载指定相对路径下的外部视频文件到电子书中,大大提高了iebook超级精灵在处理多媒体方面的实用性。