invented ultrasound

sickle made of iron is born with a blade. The shape of the sickle has been constantly improved, and the current use of the sickle is generally from the 12th to 15th century. 　 7. Lefu gunKeywords: WarIn the process of invention of human civilization, weapons are always more advanced than other tools. The gunpowder was invented by Chinese alchemy in the last four centuries. Afterwards, the gunpowder was continuously used in military affairs, and vario

the brain of an application, which organ does garbage collection correspond to?Since it's a "ruby Python" conference, I think it would be interesting to compare the garbage collection mechanisms of Ruby and Python. Before that, why bother about garbage collection? After all, it's not a glamorous, exciting theme, is it? How many of you have a cold for garbage collection? (a lot of Rupyde participants raised their hands!)The Ruby community recently published a blog post on how to speed up unit te

integration interfaces with various other frameworks, and of course, IOC, AOP is even less of a pioneer. Can you say that these things inevitably do not have "invented the wheel" suspicion? The author because of seniority and even experience are shallow, can not prove spring "invented the wheel", here just throw a doubtful proposition, but also please expert to verify. If spring's MVC, and so on, can prove

The OSI Layer-7 model is easy to understand and can't be remembered many times. I read it again today and found that it is more logical and easier to remember to look at the problem from the perspective of historical deduction. This article is not necessarily rigorous and may be flawed. It mainly serves to help people with poor memory. In general, the OSI model is developed from the bottom layer to the top layer. This model was first introduced because Americans have the need to communicate with

The second chapter is that lazy people have created a method, indeed many inventions are from the hands of lazy people, too lazy to wash clothes so invented the washing machine, lazy to walk so invented the car, lazy to climb stairs so invented the elevator, too lazy to go out to see the show so invented the TV, too la

raised.1742 Swedish astronomer Desmond establishes degrees Celsius (boiling point of water 0 degrees, freezing points 100 degrees)Massenbrock (Leiden bottle), pointing out the difference in temperature and heat (medieval scientists have known this, but never experimental measurement, just theory), the concept of heat capacity is a specific heat, proposed latent (temperature constant when the object's absorption exothermic).People think that heat is an object, and how much heat determines the st

Everything has its history, the modern computer has experienced the addition machine, multiplication machine, analysis machine, Turing machines and other stages. How does today's computer actually develop to this appearance now? I'm sure you'll be interested. The first people I guess is to use the finger to count, so most of the ancient civilization is used in the decimal. But found that 10 fingers are not enough, so people use a number of sticks, stones, rope and other things to count. But the

variety of ways, such as infrared (automatic doors for convenience stores, automatic flushing of men's public toilets), ultrasound, lasers, and much more. Similarly, Apple does not say that we can only guess or search the web as much as possible, however, proximity sensors are not urgently needed for miniaturization, not in the list of popular MEMS components.5) Sonic SensorScientific name acoustic sensor, common name microphone. Yes, IPhone 4 to enh

interesting is that there are also abusive words starting with B in English. for example, the classic son of bitch (son of a bitch, son of a bitch ). In addition, we often hear about B-ultrasound, and then the BB cream that women like, bra. C What is vitamin C in daily life, and what is the size of the bra C cover? In fact, I have no idea how big it is. then you can play C Ronaldo and programming languages C, C ++, and C #. I don't know about CCTV wh

elephant "throttled" and fell onto the ground-the ant said, "I have it-it's yours !" Female: Now, do you want to say no! Male: you said no, stop, no! Why has the second world war of Japan no longer seen an anjul? Because they have set up the "self-defense force "!! In 1980s, my wife-you cannot cheat. in 1990s, my wife-you cannot ride. In the new century, my wife-you're welcome. A nun went to the hospital for B-ultrasound, and the careless nurse gave

Medical College, North China Coal Medical College, Zunyi Medical College, Wannan Medical College, Qingdao University, Luzhou Medical College, and Inner Mongolia Medical College B and so on (21 ): lanzhou University, Nantong University, Guiyang Medical College, Liaoning Medical College, beihua University, Anhui Medical University, Binzhou Medical College, Fuyang Medical College, Jilin Medical College, Three Gorges University, Changzhi Medical College, Shanghai University of Technology,

some mechanical linkage devices on the ceiling and associating the mechanical device according to the rotation of the head, to measure the position of the forward direction of the head movement. Since then, researchers have continuously improved their use of the ultrasound tracker, electromagnetic wave, light wave, and video-type tracker. Until recently, researchers have started to adopt GPS, a Global Positioning System. GPS will receive radio signal

services for patients to increase influence on users. (6) shared output devices save device investment, such as laser cameras and DICOM cameras. (7) Reduce/eliminate repetitive work. (8) higher productivity, lower operating costs and higher income. (9) inspection materials and films will not be lost. For clinical: (1) provide faster and more effective ways to obtain patient information from hospitals. (2) provide more medical services through joint cooperation with surrounding hosp

. According to a survey, the 5-year survival rate of early-stage cancer patients after regular treatment is as high as 10%-30% compared to the 5-year survival rate after later-stage patients.Among these logs, men and women should pay attention to two of them, respectively, and should pay attention to a total of 13: What men should pay attention: 1. testicles. The age group with frequent testicular cancers is 20-39 years old. The American Cancer Association recommends that men check their testi

============================ 09:10 A.M. to the nursing home At half past nine, the OTG doctor told me that the Project template maintenance was chaotic, some common items were not maintained, some were not differentiated between left and right, and some small projects could be deleted. Let me go to him after half past ten. After about 10 minutes, Director Wang xuemin asked me to say, After completing the projects in the department of color Doppler ultrasound