Xem 1-18 trên 18 kết quả Laser surface
  • Laser scanning technology has emerged as a research field in the science and engineering arena. Laser scanning performs a procedure to detect a surface using laser technology. A scanning device analyzes a real-world object to retrieve data on its shape and its appearance. The collected data can then be used to construct a digital three-dimensional model. The aim of the scanning is usually to create a point cloud on an object surface.

    pdf270p qsczaxewd 22-09-2012 29 7   Download

  • Three-dimensional (3D) laser micro-fabrication has become a fast growing field of science and technology. The very first investigations of the laser modifications and structuring of materials immediately followed the invention of the laser in 1960. Starting from the observed photomodifications of laser rod materials and ripple formation on the irradiated surfaces as unwanted consequences of a high laser fluence, the potential of material structuring was tapped.

    pdf369p echbuon 02-11-2012 16 3   Download

  • Aluminum is the second most plentiful element on the earth and it became a competition in 19th century. The huge demand of aluminum is projected to get 70 million tons, over 30 millions being obtained from recycled scrap. The scope of aluminum ranges from household to space vehicles.

    pdf0p cucdai_1 14-10-2012 24 9   Download

  • Tham khảo sách 'recent trends in processing and degradation of aluminium alloys_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • In the eight years since publication of the first edition, enormous progress has been made in the field of skin imaging and analysis. Because of the broad array of new methods now available to the research scientist—and more and more to the clinically- oriented dermatologist—we were able to widen the scope of this book from the skin surface to the entire skin. This is also reflected in the change of the volume title, Bioengineering of the Skin: Skin Imaging and Analysis. Hence, this second edition is a major revision of the first edition, with more than 30 new chapters added....

    pdf542p hyperion75 18-01-2013 14 4   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Characterization of MHz pulse repetition rate femtosecond laser-irradiated gold-coated silicon surfaces

    pdf5p sting05 10-02-2012 18 3   Download

  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Properties of nanocones formed on a surface of semiconductors by laser radiation: quantum confinement effect of electrons, phonons, and excitons

    pdf6p dauphong11 06-02-2012 20 2   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Submonolayer Quantum Dots for High Speed Surface Emitting Lasers

    pdf13p sting10 07-03-2012 13 2   Download

  • Micromechanical photonics is evolvingin interdisciplinary research and engineering fields and merging independently developed technologies based on optics, mechanics, electronics, and physical/chemical sciences. Manufacturing technologies such as those of semiconductor lasers, surface micromachining and bulk micromachiningare promotingtec hnology fusion.

    pdf259p beobobeo 01-08-2012 32 2   Download

  • Cấu tạo: A. Kính quan sát dùng để điều chỉnh buồng đo so với xe B. Trụ treo buồng đo C. Kính quan sát dùng để nhìn vùng sáng trong buồng đo D. Bảng điều khiển E. Buồng đo F. Chân G. Dây kết nối H. Mặt kính I. Bộ phận phát tia laser 2. Thông số kỹ thuật: Các loại đèn kiểm tra : - Praboid (H4) - Projection system(DE hoặc FES) - Open surfaces (EF hoặc HNS) - XENON và LED Phạm vi đo Phía trên : 0-600 mm / 10 m (0-6%) Phía dưới : 0-600 mm /...

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  • We are living in a computer-based world. Computer use in various fields has long ceased to be fashionable and has become almost a necessity. Since the early phases of design to the final implementation of a product, the computer has replaced traditional tools, providing efficient and elegant instruments. We can say, without fear of being wrong, that the strides that mankind has taken in recent decades is due largely to computer assistance.

    pdf310p qsczaxewd 25-09-2012 42 11   Download

  • many new developments in infrared and Raman instrumentation, such as high sensitive detectors, charge-coupled devices (CCD) and array detectors, laser excitation sources, step-scan technique, photoacoustic detection, spectral depth profiling, light-fiber optics, mapping and imaging in the field of microscopy, time resolved and surface-enhanced methods - in order to mention a few of these significant improvements. Of course this progress in vibrational spectroscopy is closely connected with the enormous development in computer technique.

    pdf184p kinhdo0908 11-10-2012 33 8   Download

  • Sophisticated miniaturised components and systems may indeed change all kinds of products and equipment in the most dramatic way. Methodology and design of miniaturisation represent a broad research topic with applications in fundamental physics, chemistry, martial science, computing methods, ultra-precision engineering, fabrication technology, micromachining, and many others based on the principles, characterization, modeling, simulation, sophistication, flexibility of state-of-the-art technology.

    pdf477p thix1minh 16-10-2012 29 8   Download

  • Speckle Methods When looking at the laser light scattered from a rough surface, one sees a granular pattern as in Figure 8.2. This so-called speckle pattern can be regarded as a multiple wave interference pattern with random individual phases. In the years following the advent of the laser, this pattern was considered a mere nuisance, especially in holography (and it still is!). But from the beginning of 1970 there were several reports from experiments in which speckle was exploited as a measuring tool.

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  • Porcine reproductive and respiratory syndrome (PRRS) is one of the most significant swine diseases worldwide. Despite its relevance, serum biomarkers associated with early-onset viral infection, when clinical signs are not detectable and the disease is characterized by a weak anti-viral response and persistent infection, have not yet been identified. Surface-enhanced laser desorption ionization time of flight mass spectrometry (SELDI-TOF MS) is a reproducible, accurate, and simple method for the identification of biomarker proteins related to disease in serum.

    pdf27p ut_hai_can 25-12-2012 13 4   Download

  • The stereolithographic (SL) process is performed on the equipment shown in Figure 1. The movable platform on which the 3D model is formed is initially immersed in a vat of liquid photopolymer resin to a level just below its surface so that a thin layer of the resin covers it. The SL equipment is located in a sealed chamber to prevent the escape of fumes from the resin vat. The resin changes from a liquid to a solid when exposed to the ultra- violet (UV) light from a low-power, highly focused laser.

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  • In the past few decades there has been a widespread scientific and technological interest in laser-induced remote techniques to monitor the status of terrestrial vegetation (Svanberg, 1995). The most employed nowadays are those which exploit the fluorescence emission from the plant leaves generated in the photosynthesis process. The fluorescence of terrestrial vegetation consists almost exclusively of the fluorescence of leaves, which account for the largest surface of plants above ground.

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  • Because the photopolymer used in the SL process tends to curl or sag as it cures, models with overhangs or unsupported horizontal sections must be reinforced with supporting structures: walls, gussets, or columns. Without support, parts of the model can sag or break off before the polymer has fully set. Provision for forming these supports is included in the digitized fabrication data. Each scan of the laser forms support layers where necessary while forming the layers of the model.

    pdf119p loixinloi 08-05-2013 14 1   Download

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