Designer Materials
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The document discusses various factors to consider when choosing materials for different applications. It lists mechanical, optical, aesthetic and cost properties as important characteristics to evaluate. The document also discusses classifying materials into groups like ceramics, metals, polymers and composites based on their properties, giving examples of each type. Students are assigned to research these material classes and describe examples and characteristics.
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Plastik Malzemelerin Tasarımı ve Plastik Uygulamaları
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This document provides an introduction to quantum theory through a two-lesson presentation. It discusses key concepts like the wave nature of light seen through diffraction gratings. It also covers experiments demonstrating the particle nature of light, such as the number of photons entering the eye from a light source. The document explains how quantum theory reconciles the wave and particle behaviors of light through probability calculations for all possible photon paths. Key figures in the development of quantum theory like Richard Feynman are also mentioned.
1
This document discusses how images are represented digitally through binary data and pixels. It explains that images are made up of pixels, each with multiple brightness levels determined by the number of bits used. More bits allows for more brightness levels and possible pixel values. The document demonstrates how binary numbers represent a range of values from 0 to 2^n, where n is the number of bits. It provides examples of the number of possible values for 6-bit and 8-bit binary numbers.
Conducting Well And Badly 2
This document provides an overview of electrical conductivity and resistance in materials. It explains that good conductors allow electrons to flow easily between atoms, while insulators have a high resistance and impede electron flow. Resistance is measured in ohms and depends on a material's resistivity, length, and cross-sectional area. Conductivity is the inverse of resistivity and relates to how well a material conducts electricity. The document suggests measuring resistance of wires with varying lengths and thicknesses to calculate resistivity and conductivity.
1
Image processing techniques can smooth images by replacing each pixel with the mean of its neighbors, reducing noise and edges. Noise is removed by replacing pixels with the median value of its neighbors. Edges can be found by subtracting the values of neighboring pixels from the central pixel's value multiplied by four. Comparing squares with edges enhances the perception of edges in the human retina.
1
This document discusses different types of electromagnetic radiation and their use in imaging. It introduces the electromagnetic spectrum, explaining that while humans can only see visible light, other types of radiation like X-rays and infrared can also be used for imaging. It then covers the relationships between wave speed, frequency, and wavelength, noting that all electromagnetic waves travel at the same speed. Finally, it touches on pixels and resolution in digital images, how pixels are arranged in rows and columns, and how higher resolution allows for more detail to be seen.
1
The document discusses how to calculate the data capacity and transfer rates needed for storing and transmitting images. It explains that the data capacity required to store an image is calculated by multiplying the number of pixels by the number of bits per pixel. It also provides an example showing how to calculate the number of images that could be stored on a 20GB disc. Finally, it notes that the time to transfer data depends on the data transfer rate.
Chapter 3
The document discusses bandwidth and how it relates to transmitting signals through communication channels. It defines bandwidth as the range of frequencies a signal or channel can carry. For an analog signal, bandwidth is the maximum frequency minus the minimum frequency. The bandwidth required for a digital signal is 2 times the highest signaling rate. Time division multiplexing allows multiple calls to be transmitted simultaneously by dividing the channel into time slots.
Chapter 3
This document discusses how digital signals are transmitted using electromagnetic waves. It explains that digital signals are strings of 1s and 0s representing sampled analogue signals. Electromagnetic waves emitted from a transmitter carry these digital signals by causing electrons in a receiver to vibrate, reproducing the original signal. Key characteristics of signals like amplitude, period, and frequency are defined. Frequency is calculated as the inverse of period and examples are given. A frequency spectrum shows the range of frequencies that make up a signal. Complex signals contain multiple frequencies combined.
Chapter 3
This document discusses how analog signals are converted to digital signals through the process of sampling. It explains that sampling involves taking the value of an analog signal at discrete points in time and converting it to a digital code. The key variables in sampling are the sampling frequency, or how many samples are taken per second, and resolution, or the number of bits used to record each sample value. The sampling frequency needs to be more than double the highest frequency of the analog waveform to avoid aliasing and get an accurate digital reconstruction of the original signal. More bits of resolution provide more possible sample values and a more accurate digital representation.
A Clear View
The document discusses refraction and how light behaves when passing from one medium to another with different densities. It defines refraction as light bending or changing speed due to traveling through different mediums. Snell's law is introduced to relate the angle of incidence and refraction based on the refractive indices of the materials. The critical angle is defined as the angle at which total internal reflection occurs, with the refractive index calculated from it. Homework questions ask about using fiber optics instead of copper wires for communication and drawing a diagram showing how signal intensity changes with distance.
Conducting Well And Badly
This document provides an overview of electrical conductivity and resistance in materials. It explains that materials with free electrons allow electrical current to flow easily, making them good conductors. Materials with high resistance that restrict current flow are insulators. Resistance is measured in ohms and depends on a material's resistivity, length, and cross-sectional area. Conductivity is the inverse of resistivity and relates to how easily a material allows electrons to flow. Ohm's law defines the relationship between voltage, current, and resistance in a circuit.
Designer Materials 3
Materials react differently under stress depending on their composition and structure. A match will snap if sat on but a chair made of the same material as a match can hold weight since it is constructed differently and on a larger scale than a single match. How materials handle stress depends on both the material and the object's form.
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【业务选择办理准则】
一、工作未确定，回国需先给父母、亲戚朋友看下文凭的情况，办理一份就读学校的毕业证【微信：A575476】文凭即可
二、回国进私企、外企、自己做生意的情况，这些单位是不查询毕业证真伪的，而且国内没有渠道去查询国外文凭的真假，也不需要提供真实教育部认证。鉴于此，办理一份毕业证【微信：A575476】即可
三、进国企，银行，事业单位，考公务员等等，这些单位是必需要提供真实教育部认证的，办理教育部认证所需资料众多且烦琐，所有材料您都必须提供原件，我们凭借丰富的经验，快捷的绿色通道帮您快速整合材料，让您少走弯路。
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1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
→ 【关于价格问题（保证一手价格）
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
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选择实体注册公司办理，更放心，更安全！我们的承诺：可来公司面谈，可签订合同，会陪同客户一起到教育部认证窗口递交认证材料，客户在教育部官方认证查询网站查询到认证通过结果后付款，不成功不收费！
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