Harmonic waves
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A harmonic wave is a sinusoidal wave that undergoes simple harmonic motion. It has a smooth, repetitive oscillation described by a sine function. The key characteristics of a harmonic wave are its amplitude, wavelength, period, frequency, and phase shift. The speed of a harmonic wave can be calculated by multiplying its wavelength by its frequency. An increase in frequency would cause the velocity of a harmonic wave to increase as well, since these factors are directly correlated.
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This document provides an overview of waves, including:
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本公司拥有海外各大学样板无数，能完美还原。
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一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
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◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
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
Applied Science: Thermodynamics, Laws & Methodology.pdf
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
JAMES WEBB STUDY THE MASSIVE BLACK HOLE SEEDS
The pathway(s) to seeding the massive black holes (MBHs) that exist at the heart of galaxies in the present and distant Universe remains an unsolved problem. Here we categorise, describe and quantitatively discuss the formation pathways of both light and heavy seeds. We emphasise that the most recent computational models suggest that rather than a bimodal-like mass spectrum between light and heavy seeds with light at one end and heavy at the other that instead a continuum exists. Light seeds being more ubiquitous and the heavier seeds becoming less and less abundant due the rarer environmental conditions required for their formation. We therefore examine the different mechanisms that give rise to different seed mass spectrums. We show how and why the mechanisms that produce the heaviest seeds are also among the rarest events in the Universe and are hence extremely unlikely to be the seeds for the vast majority of the MBH population. We quantify, within the limits of the current large uncertainties in the seeding processes, the expected number densities of the seed mass spectrum. We argue that light seeds must be at least 103 to 105 times more numerous than heavy seeds to explain the MBH population as a whole. Based on our current understanding of the seed population this makes heavy seeds (Mseed > 103 M⊙) a significantly more likely pathway given that heavy seeds have an abundance pattern than is close to and likely in excess of 10−4 compared to light seeds. Finally, we examine the current state-of-the-art in numerical calculations and recent observations and plot a path forward for near-future advances in both domains.
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Applied Science: Thermodynamics, Laws & Methodology.pdf
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Harmonic waves
- 1. Harmonic Waves LEARNING OBJECT LG2- ALISON WU
- 2. What is a Harmonic Wave? If a wave is undergoing harmonic motion it is considered a harmonic wave. Simple harmonic motion is the type of periodic motion in which the restoring force is directly proportional to the displacement It is also known as a sinusoidal wave (a sin graph) It has a smooth repetitive oscillation
- 3. Which graph represents a harmonic wave? a) b) c)
- 5. Since a harmonic wave is described by a sine (or a cosine) function, its properties are determined by the amplitude (A), it’s wavelength (λ) and it’s period (T)
- 6. Characteristics of a Harmonic wave Amplitude: Corresponds to the maximum displacement from the equilibrium position of any element. Amplitude is always a positive quantity. Wavelength: The shortest distance over which a wave shape repeats is called the wavelength. Represented by the symbol lambda (λ) Wave number: the reciprocal of the wavelength Period: the time for a particle make one complete cycle T=1/f Frequency: the number of wave cycles passing a fixed point of the medium in one section Phase shift (φ) : a horizontal shift by how many units the "starting point" (0,0) of a standard sine curve, y = sin(x), has moved to the right or left.
- 7. What is the amplitude of the graph? a)-0.5 b)1 c)0.5 d)0.25
- 8. What is the wave number of the graph? a)pi b)pi/2 c)1/2 d)2
- 9. What is the phase shift? a)2pi b)2pi/3 c)pi/3 d)pi
- 10. Solutions 1. c) 0.5 2. d) 2 3. b)2pi/3
- 11. Speed of the Wave To calculate the speed of the wave you multiply the wavelength of the graph to the frequency.
- 12. Find the angular frequency when the wave has a velocity of 100m/s, a wave number of 2. a) 50 b) 0 c) 200 d) 30
- 13. Solutions 1. plug the numbers into the equation, we know that wavelength is equal to 2pi/k and frequency is equal to w/2pi 2. Sub those equations into the original formula and you will get v= w/k 3. rearrange to solve for angular frequency w=vk 4. plug in your number 5.w=100*2 w=200 c)
- 14. If the frequency increased what would happen to the velocity? a) it remains constant b) it would decrease c) it would increase
- 15. Solution C) it would increase All three factors are in direct correlation so if the frequency increased the velocity would increase to.