periscope optics

have the heart of a high person, there is a spirit of exquisite life. Even if you do not have a few money in your pocket, it is also very attractive. I have lived in China for four years. All campuses add up I have eaten 31 canteens. I have eaten at least two times per dish in every canteen. I know which canteen is the best dish, and the difference between the same dishes in different canteen tastes.If you are a Chinese science son, can you do it? This has nothing to do with money, the canteen

distance of continuous variable needs to satisfy the conditions of reflexive symmetry and triangular inequality, and Matrix D is a symmetric matrix, and the element on the diagonal is 0.The similarity coefficient should satisfy the normalization of the reflexive symmetry to satisfy the triangular inequalitiesA method of clustering based on segmentation: K-means algorithm K-center value arithmeticBased on the hierarchical clustering method, the method using distance as a measure of the standard

Protocol (Medium access Control,mac) specifies the rules for frames to be transmitted over a link. When there is only one on the end, you can send it randomly, Mac does not limit. When multiple access issues occur, the MAC protocol coordinates multiple node transfers Reliable delivery Indicates that there can be no error passing frames between the two link layer nodes. Use a similar acknowledgment and retransmission with TCP. Generally used for links with large error rates (

of the San: storage devices (disk arrays), servers, connected devices (network switching devices and fiber optics, etc.), storage management software. The advantage of a SAN is that all storage devices are highly shared, and all storage devices can be centrally managed with redundant backup capabilities, and a single server outage system still works. 650) this.width=650; "title=" 233169_thumb1 "style=" border-top:0px; border-right:0px

mistakenly put their own hand in the mirror as the left hand of the person in the mirror.To illustrate this, now close your eyes, imagine in your mind, or if you have the conditions, you can actually do the experiment. Suppose you stand in front of a mirror and hold a piece of paper in your hand, the paper is translucent and there is a word on the paper. Now flip it horizontally so that the word is in the mirror, and because the paper is translucent, you can see the same word from the back of t

geometric artboards are a common tool used in the teaching of mathematics and physics. Help a lot of users to complete their own courseware, to provide a lot of convenience to everyone. Let us introduce to you what are the features of Geometry artboards?The characteristics of geometry board are mainly embodied in the following aspects:First, convenient communication toolsSince each artboard can be modified and saved by the user according to its own intent, it is particularly well suited for geom

, don't bother with public opinion. You should be able to do your own thing with peace of conscience. Then, you can really observe, test, think ... Finally get the right solution. There is always a connection between things, which determines the order and priority of doing things. If you can figure out the order and the severity, then you find the right way.A lot of things, different people do, it all looks similar. But some of the differences in the middle of the details can lead to very differ

, the first thing to consider is how to pick up the network connection. The general user needs to find the Regional Network Center that is responsible for the area, and then make the application, and finally the network center of the area will perform the user's access operation. These operations typically include: ⑴ networked users must hire a network line to connect users to regional network centers. The line can be existing, belong to a commercial network company or a telecommunications compa

tree. Newly bought a book "Image Processing Fundamentals", such as a dictionary, or a question bank, the title of the inside like 100,000 why, to participate in school recruit students can temporarily review, of course, when we study this book is a good guide, like a paper wiki, a good reference book.This article structure diagram:Imaging principlesThe principle of imaging is why we can see the principle of things, and optics, but here we are abstra

areas, which we call cell units. Then the histogram of the direction of the gradient or edge of each pixel in the cell cell is set. Finally, the combination of these histograms can constitute a feature descriptive narrator.(3) Improve performance:The local histogram in the larger range of the image (we call it interval or block) for the Control degree normalization (contrast-normalized), the method used is: First calculate the histogram in this interval ( block), and then the cells in the inter

I am a very love of hands-on people, and the ability to do is also very strong. Remember the small time home, fan, hair dryer, tape recorder, VCD I have been torn down, very curious inside what is something, but often I take things apart can not be restored. Often attracts the scolding of the family members. Oh, but I'm not afraid of them.On the high school when the physics is very interested, I did not Friday will be the book on the test to do it all over, do it all very sleeplessA lot of thing

by refractive indexThe transmission distance of multimode optical fiber is much lower than that of unicast fiber because of the existence of die colors dispersion. The principle of modulus colors dispersion is similar to multipath fading in radio communication, and is the main factor affecting transmission distance. In order to reduce the effect of colors, it is necessary to adjust the transmission path of light in optical fiber, and to achieve this goal by changing the refractive index of the

law of geometrical optics, with reflection, refraction phenomenon, can also focus, so can use these properties for measurement, positioning, testing and other processing, in the transmission and the same speed of sound; ② ultrasonic wavelength is very short, with the transmitter, The size of the receiver is quite, the ultrasonic emitted by the transmitter does not spread to all directions, and become a very strong beam, the wavelength of the more pow

We're only a quantum computer away from God.Jesus Christ, can you create a rock that you can't lift? God smiled and did not language, silently pulled out a quantum computer.Zackerberg, one of the danale of the technology industry, is the headline of the Facebook Empire, and the headlines of the last tech news are natural, but lately we've found that he seems intent on capturing all the news sections except the tech channel.Last week he took a huge amount of money to occupy the high ground of soc

feel that their food is hopeless, but also only with Ly also is a talk, then and most people basically nothing to say, All day in the lab watching video, learning, playing code, 2.1 lines, it was really boring. There were few people in the lab, NYJ,ZYH,FQX,WJW, YCW,LY,ZKF, and me, and there were seven of them, all of them alone, And the lab's people are just a few words, nothing to talk about, and Ly compared to talk to, at that time is relatively good, that is, in the dorm there are a few budd

think this is a lot of novice need to pay attention to the problem. If ICCV2007 expressly does not write summary page direct reject, but still people ignore, this is quite not worth.3. Domestic periodicalsJournal of Automation, Journal of Computer Science, Journal of Software, Journal of Chinese Graphic Graphics, pattern recognition and artificial intelligence, optoelectronic lasers, precision optics engineering, etc.4. Neural networksNeural network-

of technical gaps have a strong market-occupying Power.Our main products are: TEC (semiconductor cooler) temperature controller, laser driver, laser controller, LED controller, led power supply and SMD component box and other more than 10 varieties. The controller product realizes the function characteristic of small volume, modularization, high efficiency, low noise and so on. The company's strong technical strength for customers involved in the field of electronic

optical module Mainly includes Optical electronic devices, functional circuits and optical interfaces, etc., is an important device in optical communication Now let fast fiber optics (feisu.com) I. Look at the demandIt's good to see. whether the requirements are met , such as clothes have many styles, light modules also have many kinds of, mainly divided into: GBIC, SFP, SFP +, XFP, SFF, CFP, etc., optical interface types include SC a

(Defprotocol X (cat [this other])Define a protocol, which is similar to the objective-C protocol. Different from Java interfaces. User => X {: On-interface user. x,: on user. x,: Sigs {: CAT {: Doc nil,: arglists ([this other]),: Name cat }},: var # 'user/X ,: method-map {: Cat: CAT },: method-builders {# 'user/cat # User => (extend-type string X (cat [this other] (. Concat this other )))This is the objc style. Define a function as an implementation of a type under a protocol. User => (Ca

light or diffuse reflection. I will not talk about it here. If you are interested, please ask a teacher in the optics field of the physics department who has been studying this problem all his life. If you are more interested, you can ask a professor in the physics department to discuss the beam and beam properties of light. Then, you can study the human eye's perception of light, and then study the response of different material surfaces to light, s