Xem 1-20 trên 97 kết quả Fabrication techniques
  • Many of the fabrication techniques require use of organic solvents and high temperature. The residues that remains after completion of process can damage cells and nearby tissues. This may also denature the biologically active molecules incorporated within the scaffolds. The gas foaming scaffold fabrication techniques does not require the utilization of organic solvents and high temperature. This technique uses high pressure carbon dioxide gas for the fabrication of highly porous scaffolds.

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  • This dissertation will outline solution processable materials and fabrication techniques to manufacture flexible electronic devices from them. Conductive ink formulations and inkjet printing of gold and silver on plastic substrates were examined. Line patterning and mask printing methods were also investigated as a means of selective metal deposition on various flexible substrate materials. These solution-based manufacturing methods provided deposition of silver, gold and copper with a controlled spatial resolution and a very high electrical conductivity.

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  • The following chapters discuss architects who have honed digital-fabrication techniques on pecific projects. Each discussion is accompanied by a detailed breakdown of the fabrication technique, providing insight into the recent projects featured in ach chapter. These are projects that concentrate on he fertile realm of one-to-one-scale experimentation, which demands reciprocity between design and mpirical innovation. The final outcomes hinge on he ability to reconcile the developmental shifts in material and working method.

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  • Nanotechnology has experienced a rapid growth in the past decade, mostly because of the rapid advances in nano-fabrication techniques employed to fabricate the nanodevices. Nano-fabrication can be divided into two categories: the first is the so-called “bottom up” approach, in which nano-structures are created either by chemical synthesis of nano-wires, nanotubes and nano-particles, or by self-assembly of nano-objects or thin layers to form quasi-periodic arrays or phase separation patterns....

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  • Most manufacturing technologies for metallic microstructures have their roots either in semiconductor (inmost cases, silicon) device production or in conventional precision machining. Of these, the techniques that are well known have been used formicrostructure dimensions. Further, they have been adapted and improved to reach the desired precision and surface quality. In some rare cases, itwas possible to use the same manufacturing process for macroscale and microscale devices and to get the desired results.

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  • Nanotechnology is an often misunderstood term. Say the word, and you are likely to elicit various conceptions from complete ignorance of the term to the fear of a science fiction type mass assembler that threatens the world. 2 The term has come to mean different things to different people. “Nano” is a prefix meaning one-billionth. In distance, a nanometer is one billionth of a meter. As illustration, a human hair is 100,000 nanometers (nm) in width. A red blood cell measures approximately 5,000 nm across. Ten hydrogen atoms, lined up side by side, if...

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  • All are expected to observe the highest standards of research integrity and to embed good practice in all aspects of their work, including the training of new researchers.They must operate honestly and openly in respect of their own actions and in response to the actions of others involved in research. 1 The spectrum of inappropriate behaviour is wide, ranging from minor misdemeanours which may happen occasionally and inadvertently, to significant acts of misappropriation or fabrication.

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  • Practically speaking, because buildings are made from a series of parts, their assembly relies on techniques of aggregating and manipulating two­ dimensional materials. Computer fabrication has opened a realm for architects to perceptually heighten and make visible the nature of this accretion through constructed repetition and difference.

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  • One of the main advantages of this technique is that it can produce the scaffold with main structural feature suitable for growth of the cell and subsequent tissue organization (Li & Tuan, 2009; Liang et al., 2007; Leong et al., 2008). It can produce the ultra fine fibers with special orientation, high aspect ratio, high surface area, and having control over pore geometry.

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  • "Nonwoven fabrics" content presentation: Raw materials, classificaion of Nonwoven, production steps for different methods, types of webs and their forming techniques, nonwoven fabric bonding techniques,... Invite you to consult.

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  • The hole closing reported in this letter is certainly not caused by deposition of carbon-rich material by the electron beam, a common phenomenon in electron microscopy. The observation that large pores expand is in direct contradiction with potential contamination growth. Secondly, electron-energy-loss spectra (EELS) locally obtained on the material that filled a nanopore clearly show the presence of silicon and oxygen,but the absence of any carbon (detection limit was less than 2%).

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  • This unit could be assessed in conjunction with any other units addressing the safety, quality, communication, materials handling, recording and reporting associated with applying fabrication, forming and shaping techniques or other units requiring the exercise of the skills and knowledge covered by this unit. Assessors must be satisfied that the candidate can competently and consistently perform all elements of the unit as specified by the criteria, including required knowledge, and be capable of applying the competency in new and different situations and contexts. ...

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  • Architecture continually informs and is informed by its modes of representation and construction, perhaps never more so than now, when digital media and emerging technologies are rapidly expanding what we conceive to be formally, spatially, and materially possible. Digital fabrication, in particular, has spurred a design revolution, yielding a wealth of architectural invention and innovation. How designs use digital fabrication and material techniques to calibrate between virtual model and physical artifact is the subject of this book.

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  • It is inconceivable today to imagine designing buildings without the use of computers. They are used at every step of the architectural process, from conceptual design to construction. Three­ dimensional modeling and visualization, generative form finding, scripted modulation systems, structura and thermal analyses, project management and coordination, and file-to-factory production are just some of the digital practices employed by architects and building consultants.

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  • Architects have been drawing digitally for nearly thirty years. CAD programs have made two­ dimensional drawing efficient, easy to edit, and, with a little practice, simple to do. Yet for many years, as the process of making drawings steadily shifted from being analog to digital, the design of buildings did not really reflect the change. CAD replaced drawing with a parallel rule and lead pointer, but buildings looked pretty much the same. This is perhaps not so surprising-one form of two-dimensional representation simply replaced another.

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  • A special method to manufacture metallic microstructures is SLM. It is one of the rare generative methods for metals and is normally taken into the list of rapid prototyping technologies. The technique is completely different than the abrasive techniques described so far.On a base platformmade of the desiredmetalmaterial, a thin layer of a metal powder is distributed. A focused laser beam is ducted along the structure lines given by a 3DCADmodel,which is controlled by a computer.With the laser exposure, themetal powder ismelted, forming a welding bead.

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  • Misalign- ment will lead to non-regular channels and thereforemay interfere with the bonding technique; in severe cases, it may lead to the destruction of the complete device. A correct alignment will lead to only small deviations fromthe desired elliptical shape, and the distortion while the bonding process takes place will be minimum. Align- ment techniques used to avoid errors can be simplemechanicalmethods (e.g. use of alignment pins), edge catches in a specially designed assembling device or optical methods such as laser alignment.

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  • Owing to the diffusion ofmaterial fromone foil to another, no borderline limitations between single foils in terms of heat transfer exist any more. Thus, the thermal behavior of diffusion-bonded devices is superior in comparison to that of the devices manufactured by other bonding techniques. In Figure 1.13, the diffusion bonding process chain is shown clockwise, starting with the single foils stack of a cross-flow stainless steel device. Figure 1.14 shows a cut through a diffusion-bonded stainless steel device.

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  • Freeform fabrication technology does not require pre-formed mandrels or tooling; instead, it builds physical objects directly from computer graphical data. This type of technology is also known as layer manufacturing, since it constructs the three- dimensional object layer by layer (Jacobs, 1992; Beaman et al., 1997). The technology has proved that it can help to rapidly provide feedback on design concepts, discover inconsistencies in the design, modify the design, and eliminate inconsistency before fabricating the design.

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  • In 2006 Korean shipbuilding companies got new orders of 19,585,000 CGT, which was the highest number since 2000. Moreover in the first half of 2007 Korean shipbuilders have received 51.3% more orders than that of a year ago. Strong demand for new vessels was expected to continue for the next few years at least, due to expanding world-wide seaborne trade, especially between China and USA, and increasing need of new ships to adapt new International Maritime Organization’s requirements.

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