Refraction

Xem 1-20 trên 75 kết quả Refraction
  • The first recorded time a human lens was removed for the purpose of addressing a refractive error was by an ophthalmologist named Fukala in 1890. We do not know what type of criticism he experienced, but we know that today he is a forgotten man in ophthalmology. The introduction of this as a concept in the late 1980s by both Drs.Paul Koch and Robert Osher’s manuscripts, resulted in considerable disdain and some condemnation by some of their colleagues and peers

    pdf243p ozon_ozon 04-05-2012 41 8   Download

  • Tham khảo tài liệu 'refractive lens surgery - part 1', y tế - sức khoẻ, y học thường thức phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf24p meomap5 10-12-2011 25 4   Download

  • The first recorded time a human lens was removed for the purpose of addressing a refractive error was by an ophthalmologist named Fukala in 1890. We do not know what type of criticism he experienced, but we know that today he is a forgotten man in ophthalmology. The introduction of this as a concept in the late 1980s by both Drs.Paul Koch and Robert Osher’s manuscripts, resulted in considerable disdain and some condemnation by some of their colleagues and peers.

    pdf240p 951864273 09-05-2012 28 4   Download

  • Tuyển tập các báo cáo nghiên cứu khoa học ngành y học tạp chí Medical Sciences dành cho các bạn sinh viên ngành y tham khảo đề tài: Refractive Status and Prevalence of Refractive Errors in Suburban School-age Children...

    pdf12p thulanh9 07-10-2011 25 3   Download

  • Đầu dò độ dẫn điện được sử dụng rộng rãi chủ yếu trong sắc ký trao đổi ion (cation và anion). Nhưng nói chung nó chỉ đựoc dùng trong những trường hợp đặc biệt. Cấu tạo: CONDUCTIVITY DETECTOR 2.2 The refractive index detector : đầu dò chiết suất RI Nguyên tắc hoạt động: Principles Đầu dò chiết suất RI là một đầu dò được sử dụng trong sắc ký lỏng cao áp.

    pdf7p zues05 23-06-2011 227 82   Download

  • Đối với những vật thể có kích thước nhỏ hơn , sóng radio sẽ đi qua vật thể mà không trở lại. 5- Hiện tượng khúc xạ thấp: sub-refraction Trong những điều kiện khí quyển đặc biệt, chỉ số khúc xạ có thể thay đổi làm cho sự bức xạ sóng sẽ khúc xạ lên trên hoặc xuống dưới hơn bình thường. Hiện tượng khúc xạ thấp thường xảy ra ở vĩ độ cao khi 1 khối khí lạnh thổi tới 1 bề mặt nóng.

    pdf5p artemis07 15-09-2011 80 32   Download

  • The most widely used analytical separation technique for the qualitative and quantitative determination of chemical mixtures in solution in the pharmaceutical industry is high-performance liquid chromatography (HPLC). However, conventional detectors used to monitor the separation, such as UV, refractive index, fluorescence, and radioactive detectors, provide limited information on the molecular structure of the components of the mixture. Mass spectrometry (MS) and nuclear magnetic resonance (NMR) are the primary analytical techniques that provide structural information on the analytes.

    pdf36p bigbaby87 03-09-2010 63 15   Download

  • Nêu 2 lý do chính ñe s dng m ng tê bào? - Tăng dung lư ng - Gim công xuât phát/thu  Gim nhieu  tăng chât lư ng he thông 2. Các nguôn nhieu chính nh hưng ñên m ng thông tin tê bào? Xem chương 2, 3 (Shadowing, reflection, Refraction, scattering, diffraction (nhieu x ); multipath, interference, dropler, )

    pdf2p cotrai1234 26-07-2012 60 13   Download

  • Optical devices in communication and computation have a significant impact on our daily life, although we may not even be aware of their existence, as in case of inter-continent fiber cables that connect people around the world, making it a global village. Novel nanoscale structures have demonstrated a wide range of unique features; therefore have became a hot research topic. Not only that the novel structural materials are used in biomedical therapy, but also the nature inspires the design of innovative optical structures....

    pdf240p cucdai_1 16-10-2012 27 13   Download

  • This book contains information about the technological development of ion exchange in their application for industrial processes. Widely used and well known fields of ion exchange like chromatography and electromembrane technology are described in this book with experimental details. Designing new materials for nanotechnology and nanomaterials as ion exchanger are also explained by experimental proofs. Ion exchange book is suitable not only for postgraduate students but also for researchers in chemistry, biochemistry and chemical technology....

    pdf376p camchuong_1 04-12-2012 52 12   Download

  • The Intensity-Dependent Refractive Index Các chỉ số khúc xạ của nhiều vật liệu quang học phụ thuộc vào cường độ của ánh sáng được sử dụng để đo lường chỉ số khúc xạ. Trong chương này, chúng tôi kiểm tra một số các mô tả toán học của chỉ số khúc xạ phi tuyến và kiểm tra một số các quá trình vật lý làm tăng hiệu ứng này.

    pdf46p hoatuongvihong 06-11-2011 37 11   Download

  • In 2001 I was contacted by a consortium of research institutions and wind energy interests with a request to provide some background information on the operational characteristics of acoustic radars or SODARs. The consortium partners had set up and been funded for an European EU project to evaluate SODARs as a tool in monitoring wind flows at wind turbine sites. They felt reasonably confident in their knowledge of SODARs and had purchased some instruments, but wanted to be able to consult on any more complex issues which arose.

    pdf284p 951628473 07-05-2012 75 10   Download

  • POLARIZATION DEVICES A. Polarizers B. Wave Retarders C. Polarization Rotators Augustin Jean Fresnel (1788-1827) advanced a theory of light in which waves exhibit transverse vibrations. The equations describing the partial reflection and refraction of light are named after him. Fresnel also made important contributions to the theory of light diffraction.

    pdf45p doroxon 18-08-2010 51 9   Download

  • SIMPLE OPTICAL COMPONENTS A. Reflection and Refraction B. Transmission Through Optical Components C. Graded-Index Optical Components INTERFERENCE A. Interference of Two Waves B. Multiple-Wave Interference POLYCHROMATIC LIGHT A. Fourier Decomposition B. Light Beating

    pdf39p doroxon 18-08-2010 49 8   Download

  • An optical fiber is a cylindrical dielectric waveguide made of low-loss materials such as silica glass. It has a central core in which the light is guided, embedded in an outer cladding of slightly lower refractive index (Fig. 8.0-l). Light rays incident on the core-cladding boundary at

    pdf38p doroxon 18-08-2010 51 8   Download

  • Diffraction When light passes an edge, it will deviate from rectilinear propagation. This phenomenon (which is a natural consequence of the wave nature of light) is known as diffraction and plays an important role in optics. The term diffraction has been conveniently defined by Sommerfeld as ‘any deviation from rectilinear paths which cannot be interpreted as reflection or refraction’. A rigorous theory of diffraction is quite complicated. Here we develop expressions for the diffracted field based on Huygens’ principle of secondary spherical wavelets.

    pdf31p huggoo 23-08-2010 54 7   Download

  • Fiber optic connectors are produced by polishing their endfaces to create a smooth domed shape. If the shape or endface geometry is precisely controlled, the result will be physical contact between fiber cores when two connectors are mated together. The polishing process creates a very small damaged layer at the tip of the fiber that has a higher index of refraction (index layer) than the glass before the damaged layer.

    pdf3p maiphuong 14-08-2009 78 6   Download

  • The refractive index of an optical medium is altered by the presence of sound. Sound therefore modifies the effect of the medium on light; i.e., sound can contro2 light (Fig. 20.0-l). Many useful devices make use of this acousto-optic

    pdf33p doroxon 18-08-2010 45 6   Download

  • Fibre Optic Thermometers Properties of Optical Fibres Dielectric opticalfibre, which is also referred to as a light guide, is composed of a rod core surrounded by a sheath as shown in Figure 6.1 . The core, which conducts the electromagnetic wave, has a refractive index, nj , while the sheath, which contains the wave within the core, has a refractive index, n2 . To ensure that the wave is contained in the core it is necessary that the condition nj n2 is satisfied. The electromagnetic waves incident on the front part of the optical fibre, within the angle cone, 2a,...

    pdf14p tienvovan 16-09-2010 46 6   Download

  • Visual Acuity The Snellen chart is used to test acuity at a distance of 6 m (20 ft). For convenience, a scale version of the Snellen chart, called the Rosenbaum card, is held at 36 cm (14 in) from the patient (Fig. 29-1). All subjects should be able to read the 6/6 m (20/20 ft) line with each eye using their refractive correction, if any. Patients who need reading glasses because of presbyopia must wear them for accurate testing with the Rosenbaum card. If 6/6 (20/20) acuity is not present in each eye, the deficiency in vision must be...

    pdf6p ongxaemnumber1 29-11-2010 33 6   Download

CHỦ ĐỀ BẠN MUỐN TÌM

Đồng bộ tài khoản