Porous particle

Xem 1-20 trên 53 kết quả Porous particle
  • Volume flow rate of compressed air is provided by a separate rate Pneumatic valve for each engine. This article is structured as follows: first, a mathematical modeling of mechatronic systems origin, which results in a state-space description of nonlinear icon.

    pdf486p lulanphuong 23-03-2012 55 12   Download

  • Introduction: Most electrochemical reactions take place at the interface of two or more phases. Hence the area of reaction plays a vital role in determining the efficiency of an electrochemical process, just like in any surface reaction. There are several ways to increase the available area for reaction in an electrochemical cell: multiple electrodes are stacked alternatively, bipolar electrodes are used, and, sometimes, the reaction surface is modified by etching or coating with large surface area particles. ...

    pdf11p congdat261 06-12-2010 71 7   Download

  • Determination of periodontal diagnosis and the extent and severity of periodontal tissue damage through standard periodontal assessment has traditionally been based on an array of clinical measurements, including probing depth (PD), clinical attachment level (CAL), bleeding on probing (BOP), plaque index (PI) and radiographic findings.

    pdf77p pt_1669 27-03-2012 239 125   Download

  • April Klein finds a negative relation between audit committee independence and earnings management. 10 This finding is consistent with the idea that a lack of independence impairs the ability of boards and audit committees to monitor management. On the other hand, audit committees of corporate boards are typically not very active. They usually meet just a few (two or three) times a year.

    pdf456p bin_pham 06-02-2013 45 18   Download

  • The amount of energy that people used in the past two decades is equivalent to the total amount of energy in the past. This huge increase of energy use has been made possible by extending depletion of fossil reserves and is clearly unsustainable. Does it mean that once the reserves are exhausted the amount of energy available to humans would be similar before the era of fossil fuels? Not necessarily. Currently, the total energy used by mankind No. 1/5500 fraction of the total incident solar energy on earth....

    pdf212p samsungwifi 04-04-2012 89 14   Download

  • Adsorption occurs whenever a solid surface is exposed to a gas or liquid: it is defined as the enrichment of material or increase in the density of the fluid in the vicinity of an interface. Under certain conditions, there is an appreciable enhancement in the concentration of a particular component and the overall effect is then dependent on the extent of the interfacial area. For this reason, all industrial adsorbents have large specific surface areas (generally well in excess of 100mZg-I) and are therefore highly porous or composed of very fine particles...

    pdf465p tuyetmuadong2013 06-04-2013 45 13   Download

  • A questionnaire was applied including variables social, demographic, occupational, clinical, toxicological and tomatoes consumption habits. The pilot study was carried out on 10% of the total of the sample, although they did not make part of the research. Following the criteria of inclusion, all laborers engaged in tomato planting entered into the study, provided that they were permanent residents in the community, who had used OF, C and OC pesticides at least during the six months previous to the study, and also who volunteered to participate in the study....

    pdf182p conquynho32 18-09-2012 30 8   Download

  • Chromatography is the separation method for biological molecules from the analytical to the preparative scale. Few of the recent advances in life science, whether in "proteomics" or in the industrial production of recombinant therapeutics, would have been possible without the help of chromatographic separations. Concomitantly, chromatography nowadays stands for much more than a batch column packed with porous particles

    pdf251p doilan 26-01-2013 32 8   Download

  • This is due to the fact that in green leaves, the chlorophylls and carotenoids have a broad absorption band in the 400-500 nm spectral region and blue light does not penetrate very deeply into the leaf tissue, and as a result the fluorescence associated to blue light excitation is mainly generated in the green mesophyll cells close to the leaf`s surface, therefore little absorption occurs.

    pdf474p conquynho32 14-09-2012 53 7   Download

  • Cigarette smokers were 2.7 times more likely to have respiratory diseases than those of non-smokers. Similarly consumption of alcohol and use of non-smoked tobacco were found to be risk factors of hypertension. BMI more than 25 was risk factor for hypertension and diabetes. On the other hand risk of respiratory diseases and cataract increased below a BMI of 18.5. Risk for musculoskeletal problems was found to be higher in both extremes of physical status. The higher risk of diseases to the both extremes of BMI suggests a U- shaped relationship of diseases with BMI. BMI less 18.

    pdf19p taisaokhongthedung 01-01-2013 46 7   Download

  • Pulp and paper is a mature industry. Industrialised paper manufacturing in Europe started in the early 19th century (Berkhout, 2005). It is a capital and resource-intensive industry that contributes to many environmental problems, including global warming, human tox- icity, eco-toxicity, photochemical oxidation, acidification, nutrification, and solid wastes (Blazejczak and Edler, 2000). Paper is made of natural fibres, either from wood or from recycled materials. Figure 1 below presents a schematic representation of the production system.

    pdf52p loixinloi 08-05-2013 63 6   Download

  • Humidity is one of the main causes of decay in buildings, particularly rising damp, caused by the migration of moisture from the ground through the materials of the walls and floors via capillary action. This water comes from groundwater and surface water. The height that moisture will reach through capillary action depends upon factors such as the quantity of water in contact with the particular part of the building, surface evaporation conditions, wall thickness, building orientation and the presence of salts....

    pdf0p aries23 29-09-2012 24 5   Download

  • Our empirical analysis uses two different data sources: the RobertWood Johnson Foundation’s 1997 Employer Health Insurance Survey (EHIS) and MEDSTAT MarketScan commercially insured health claims and eligibility information for 1998–1999. We first use the EHIS data to examine turnover patterns and their relationship to firm and employee characteristics. The EHIS data reveal that small firms are very heterogeneous; the heterogeneity concerns workers’ turnover rates, besides workers’ age distribution and other health-related demographic variables.

    pdf5p quaivatxanh 29-11-2012 35 5   Download

  • In many developed nations, significant progress has been made in reducing direct discharges of pollutants into water bodies, primarily through increased treatment of industrial wastewater before it is discharged. An OECD report found that in member countries in the past several decades, “industrial discharges of heavy metals and persistent chemicals have been reduced by 70-to-90 percent or more in most cases” (OECD 2006).

    pdf53p saimatkhauroi 01-02-2013 26 5   Download

  • There is growing recognition of the large health and productivity costs imposed by poor indoor environmental quality (IEQ) in commercial buildings—estimated variously at up to hundreds of billions of dollars per year. This is not surprising as people spend 90% of their time indoors, and the concentration of pollutants indoors is typically higher than outdoors, sometimes by as much as 10 or even 100 times. 6 The relationship between worker comfort/pro- ductivity and building design/operation is com- plicated.

    pdf10p doipassword 01-02-2013 39 5   Download

  • Physical units can be specific to the kind of resource recorded (tonnes, cubic meters, hectares, number of units) or common to a range of resources. In this case, a unit-equivalent needs to be found. For example, material flow accounts which are currently the main basis for resource-efficiency analysis record 'everything' in tonnes. Another solution is to use carbon or energy unit-equivalents, as in UNFCCC reporting. The Ecological Footprint Accounts propose surface area as a general unit-equivalent. These solutions are obviously incomplete (e.g.

    pdf34p bin_pham 06-02-2013 45 5   Download

  • About 95% of the renewable energy sold to consumers through green pricing programs was supplied from projects meeting the generally accepted industry definition of “new.” Renewable energy sold through green pricing programs in 2008 represents an equivalent renewable energy capacity of more than 1,500 MW, with more than 1,400 MW of this represented by “new” renewable energy resources (Table 11).

    pdf49p lenh_hoi_xung 21-02-2013 28 5   Download

  • Depending on the purpose of the classification, various factors and criteria are considered (e.g. example the ecosystem functions, the end-use of the product, type of users, economic value, property regimes, management characteristics, etc.). However, none of the classification schemes are universal, and all of them have advantages or disadvantages, depending on the context of their application. Bearing in mind the FORVALUE objectives and its main accent on the non-market forest goods and services, four classification approaches, were considered and are describe in more detail.

    pdf0p dangsuynghi 15-03-2013 36 5   Download

  • Beneficiation (or concentration) processes are gener- ally used to upgrade the phosphate content by removing contaminants and barren material prior to further processing. A few ores are of sufficiently high quality to require no further concentration. The natu- rally occurring impurities contained in phosphate rock ore depend heavily on the type of deposit (sedi- mentary or igneous), associated minerals, and the extent of weathering. Major impurities can include organic matter, clay and other fines, siliceous material, carbonates, and iron bearing minerals.

    pdf25p tieuyeuquai456 05-10-2012 35 4   Download

  • Agriculture faces the enormous challenge o producing globally almost 50% more food b 2030 and doubling production by 2050. Thi will likely need to be achieved with less wat mainly because of growing pressures from urbanisation, industrialisation and climate change. In this context, it will be important in the future for farmers to receive the right signals to increase water use efficiency and improve agricultural water management, wh preserving aquatic ecosystems.

    pdf168p lulaula 25-10-2012 25 4   Download

CHỦ ĐỀ BẠN MUỐN TÌM

Đồng bộ tài khoản