Xem 1-20 trên 21 kết quả Porosity
  • Đề tài: Nghiên cứu tính thấm nước của bê tông rỗng the permeability of enhanced porosity concrete đi sâu về nghiên cứu mối quan hệ gíữa độ rỗng, kích thước hạt cốt liệu dùng để chế tạo bê tông rỗng, kích thước lỗ rỗng tới đặc tính thấm của bê tông rỗng. Với các bạn chuyên ngành Xây dựng thì đây là tài liệu hữu ích.

    pdf5p pjflexri 10-03-2015 26 10   Download

  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : Effects of low intensity pulsed ultrasound with and without increased cortical porosity on structural bone allograft incorporation

    pdf12p panasonic10 13-01-2012 24 2   Download

  • Hybr idity and Connect ivity br ing act ivit ies and people together, rather than isolate objects and separate functions. These qualities also treat people and nature as symbiot ic—as well as buildings and landscape—rather than opposit ional. Porosity preserves the integr ity of that which is brought together while allowing mutual access through permeable membranes, rather than the modernist at tempt to dismantle boundaries or postmodernist fortiication.

    pdf232p tiramisu0908 25-10-2012 38 2   Download

  • Unit 10. Soil texture, porosity, acidity Nguyễn Thị Minh Nguyệt Tiếng anh chuyên ngành Thổ nhưỡngvà Môi trường đất NXB Đại học quốc gia Hà Nội 2007. Tr 92 – 100. Tài liệu trong Thư viện điện tử ĐH Khoa học Tự nhiên có thể được sử dụng cho mục đích học tập và nghiên cứu cá nhân. Nghiêm cấm mọi hình thức sao chép, in ấn phục vụ các

    pdf10p xingau5 13-08-2011 58 25   Download

  • Mối liên quan giữa kết cấu, dung trọng khô và độ rỗng (texture, bulk density and porosity of soils) Đất trong thuật ngữ chung là các vật chất nằm trên bề mặt Trái Đất, có khả năng hỗ trợ sự sinh trưởng của thực vật và phục vụ như là môi trường sinh sống của các dạng sự sống động vật từ các vi sinh vật tới các loài động vật nhỏ.

    ppt36p dungdiem 21-02-2013 37 9   Download

  • Modern physics is confronted with a large variety of complex spatial structures; almost every research group in physics is working with spatial data. Pattern formation in chemical reactions, mesoscopic phases of complex fluids such as liquid crystals or microemulsions, fluid structures on planar substrates (well-known as water droplets on a window glass), or the large-scale distribution of galaxies in the universe are only a few prominent examples where spatial structures are relevant for the understanding of physical phenomena....

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  • This book reviews a big window of opportunity for piezoelectric ceramics, such as new materials, material combinations, structures, damages and porosity effects. In addition, applications of sensors, actuators, transducers for ultrasonic imaging, positioning systems, energy harvesting, biomedical and microelectronic devices are described. The book consists of fourteen chapters. The genetic algorithm is used for identification of RLC parameters in the equivalent electrical circuit of piezoelectric transducers.

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  • This book is intended to present for the first time experimental methods to measure equilibria states of pure and mixed gases being adsorbed on the surface of solid materials. It has been written for engineers and scientists from industry and academia who are interested in adsorption based gas separation processes and/or in using gas adsorption for characterization of the porosity of solid materials

    pdf436p tuyetmuadong2013 06-04-2013 24 8   Download

  • Defects, the scourge of the metalcaster. These can be as simple as broken or loose sand, or more complicated like gas bubbles. In any case, it doesn't look good, and it may make the casting useless. Now, I'm pretty good at casting , so I don't make many mistakes... but here's one that got by me: Flash This casting shows a very common defect, flash. This is where the mold somehow seperated enough to allow metal between the halves, along the parting line. (See also the trivet for more flash.) You can see the inside circle here is nearly completely filled in with flash. ...

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  • Porous hydroxyapatite ceramic was synthesized by solid phase method using Ca(OH)2 and Ca3(PO4)2 at the temperature interval 200 - 350o C. The samples, after pelleting and sintering, were characterized by X-ray diffractometry (XRD), Fourier transform infra-red spectroscopy (FTIR), scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). Porous structure of hydroxyapatite was obtained with the 42 – 55% porosity.

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  • A clear understanding of rock stress and its effect on permeability is important in a coupled simulation where fluid production causes a significant increase in the effective stress within a reservoir. Changing the in-situ rock stress state can alter the reservoir properties. As a result, porosity and permeability could be affected due to the rearrangement of rock particles and the redistribution of sensitive pore structures. It is known that permeability is more sensitive to stress changes than porosity.

    pdf11p can_loc 27-07-2012 37 6   Download

  • Following site characterization, working hypotheses about important mechanisms that control the behavior of injected CO2 are developed and tested. This approach has been studied extensively over the last decade from a risk assessment perspective (Savage et al., 2004; Lewicki et al., 2006). The mechanisms that have controlled past behavior, and will control future behavior, need to be understood through fluid flow simulation based on an understanding of the fluid and chemical processes active at the pore level and guided by available injection/production and monitoring data.

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  • Scaffolds A scaffold provides a three-dimensional framework to support the tissue or organ-specific cells. The scaffold not only provides mechanical support, but it must also supply critical nutrients and transport metabolites to and from the developing tissue. Important scaffold properties vary depending on the tissue but typically include specific biomechanical properties, porosity, biocompatibility, and appropriate surface characteristics for cell adhesion and differentiation. Scaffolds can be natural materials or synthetic polymers and are typically biodegradable.

    pdf5p konheokonmummim 03-12-2010 42 5   Download

  • Forests play an important role in reducing erosion. In Vietnam, destroying natural forests in mountainous areas has caused serious environmental problems for sustainable development. Required forest areas for protection of soils from erosion in Vietnam are defined in this study. An algorithm of defining required forest area for soil erosion prevention is based on a comparison of soil loss prediction and its threshold of 10 ton ha-1yr-1 (soil loss tolerance) within the GIS environment. Soil loss is predicted from rainfall erosivity index, slope, porosity and...

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  • Porogen leaching is one of the most common methods used for preparation of scaffolds with controlled porosity. The particulate leaching method is totally based upon the dispersion of porogen (salt, sugar and wax) either in liquid particulates or powdered materials (Hou et al., 2003; Lee et al., 2004, Nazarov et al., 2004 Vepari & Kaplan, 2007) by the process of evaporation, cross linking or other reaction liquid may be solidified. These porogens act as place holder for pore and interconnection of the pores in the actual scaffolds fabrication technique.

    pdf84p quynho77 13-11-2012 27 2   Download

  • In reality, the reservoir rock space is a very complex metamerism; however when caculating according to the common way, in many cases, we consider the void structure in the rocks as similar fractal, and use suitable statistical approximate formula to demonstrate the space in form of effective homogene. When researching the layers, we take the rock samples from one layer with different collector parameter. To get a parameter value (grain density, porosity, permeability, saturation etc.

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  • Some physical qualities include soil density, permeability, porosity, temperature, thermal conductivity and heat capacity. These properties dictate how the biologicalmicro organisms whichfeedontheplantorganicmattersurvive.Forexamplethepenetrationofheat,waterand otheressentialorganicresiduedependsonthedensityofthesoil.Bioenergycropswiththeir extensiveandheavyrootsystemhaveanessentialroletoplayhere. Inadditionto increasing thesoilcarboncontenttheycanimprovesoildensityandporosity....

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  • In this report, the poly(Tyramine) (PTyr) film structure was further studied and determined, based on IR (Infrared), XPS (X-Ray Photoelectron Spectroscopy), EQCM (Electrochemical Quartz Crystal Microbalance) results. Especially, the immobilization capacity of PTyr was investigated by EQCM in situ measurement. The results showed the film porosity had increased the immobilization capacity of PTyr, compared to other polymer film with the same NH2 surface concentration.

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  • The carbon dioxide molecule becomes cluster to minimize the free energy; as a result pore nucleation is created. These pores cause the significant expansion of polymeric volume and decrease in polymeric density. A three- dimensional porous structure (scaffolds) is formed after completion of foaming process. The porosity of the scaffolds is controlled by the use of porogens like sugar, salts and wax (Ikada, 2006).

    pdf75p quynho77 13-11-2012 14 1   Download

  • Porous metal organic framework nanoscale carriers as a potential platform for drug delivery and imaging, In the domain of health, one important challenge is the efficient delivery of drugs in the body using non-toxic nanocarriers. Most of the existing carrier materials show poor drug loading and or rapid release of the proportion of the drug that is simply adsorbed at the external surface of the nanocarrier.

    pdf7p hotrotaitailieu 30-03-2016 6 1   Download

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