Interference in sound waves
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Interference in sound waves
Whales A and B are calling out to their lost baby whale C. For their calls to cancel out and not reach whale C, whales A and B must be 44.5x meters apart, where x is an integer. For their calls to combine and be the loudest when reaching whale C, whales A and B must be 89x meters apart, where x is an integer. The document explains how wavelength is used to calculate the distances between whales A and B for destructive and constructive interference of the sound waves to occur when reaching whale C.
Learning object 1 soundwaves (corrected)
Dogs can hear higher frequency sounds than humans because they can detect frequencies up to 60,000 Hz while humans are limited to 20-20,000 Hz. A sound wave is a longitudinal pressure wave consisting of compressions and rarefactions that can be characterized by its frequency, wavelength, amplitude, and speed. The document then provides an example problem calculating the frequency of a whistle based on given properties of air, determining that the frequency is within the hearing ranges of both dogs and bats but not humans.
Learning object 1 soundwaves
Dogs can hear higher frequencies than humans because their hearing range is 40-60,000 Hz while humans can generally hear 20-20,000 Hz. This means dogs can hear sounds that are too high in frequency for humans to detect. The document then provides information on sound waves, terms related to sound, and works through an example problem to calculate the frequency of a whistle and determine if a human, dog, or bat could hear it (24.2 kHz frequency, which humans cannot hear but dogs and bats can).
The doppler effect
The Doppler effect describes how the frequency of a wave (such as sound) is altered by the relative motion between the source of the wave and the observer. When an ambulance's siren passes by, its frequency is higher as it approaches and lower as it moves away due to the Doppler effect. The effect can be calculated using equations that take into account the velocity of the source, receiver, and sound itself. An example calculation demonstrates how a driver would observe different frequencies for an approaching versus passing ambulance.
the doppler effect by Brigette Wee
The Doppler Effect describes how the frequency of a wave is altered depending on the relative motion between the source of the wave and the receiver. When the source and receiver are moving towards each other, the received frequency is higher than the emitted frequency. When they are moving away from each other, the received frequency is lower. This phenomenon can be expressed through a Doppler Effect equation where the signs in the numerator and denominator depend on whether the source and receiver are moving towards or away from each other. The document then provides examples of applying the Doppler Effect equation to different scenarios involving a stationary or moving source and receiver, including calculating the frequency detected by a female whale from a sound wave emitted by a male whale as they move towards each other to mate
Pre-Cal 40S Slides November 19, 2007
The document summarizes information about the population of Calgary, Canada in 1995:
- In 1995, the population of Calgary was 828,500 and was increasing at a rate of 2.2% per year.
- It provides questions to calculate how long it would take for the population to double, when it would reach 1 million, and write the population equation as an exponential function.
Lecture22
1. The lecture covered sound waves and their properties including speed of sound in different mediums, intensity, loudness, standing waves in pipes, and the Doppler effect.
2. Honors papers are due on Friday, November 12th by email. There will be a special quiz after Thanksgiving.
3. The speed of sound is higher in helium than in air, so the fundamental frequency of a pipe would decrease if the air inside was replaced with helium.
Timmy physics #1
Timmy is riding waves at the beach and his father determines he is oscillating at 3.0 Hz. A coastguard 200m away sees Timmy's position change by 6.7 degrees between his highest and lowest points. Using trigonometry and the angular frequency, the document calculates Timmy's amplitude as 11.7m. Timmy's maximum velocity is then determined to be 221 m/s by multiplying the angular frequency by the amplitude.
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Interference in sound waves
Whales A and B are calling out to their lost baby whale C. For their calls to cancel out and not reach whale C, whales A and B must be 44.5x meters apart, where x is an integer. For their calls to combine and be the loudest when reaching whale C, whales A and B must be 89x meters apart, where x is an integer. The document explains how wavelength is used to calculate the distances between whales A and B for destructive and constructive interference of the sound waves to occur when reaching whale C.
Learning object 1 soundwaves (corrected)
Dogs can hear higher frequency sounds than humans because they can detect frequencies up to 60,000 Hz while humans are limited to 20-20,000 Hz. A sound wave is a longitudinal pressure wave consisting of compressions and rarefactions that can be characterized by its frequency, wavelength, amplitude, and speed. The document then provides an example problem calculating the frequency of a whistle based on given properties of air, determining that the frequency is within the hearing ranges of both dogs and bats but not humans.
Learning object 1 soundwaves
Dogs can hear higher frequencies than humans because their hearing range is 40-60,000 Hz while humans can generally hear 20-20,000 Hz. This means dogs can hear sounds that are too high in frequency for humans to detect. The document then provides information on sound waves, terms related to sound, and works through an example problem to calculate the frequency of a whistle and determine if a human, dog, or bat could hear it (24.2 kHz frequency, which humans cannot hear but dogs and bats can).
The doppler effect
The Doppler effect describes how the frequency of a wave (such as sound) is altered by the relative motion between the source of the wave and the observer. When an ambulance's siren passes by, its frequency is higher as it approaches and lower as it moves away due to the Doppler effect. The effect can be calculated using equations that take into account the velocity of the source, receiver, and sound itself. An example calculation demonstrates how a driver would observe different frequencies for an approaching versus passing ambulance.
the doppler effect by Brigette Wee
The Doppler Effect describes how the frequency of a wave is altered depending on the relative motion between the source of the wave and the receiver. When the source and receiver are moving towards each other, the received frequency is higher than the emitted frequency. When they are moving away from each other, the received frequency is lower. This phenomenon can be expressed through a Doppler Effect equation where the signs in the numerator and denominator depend on whether the source and receiver are moving towards or away from each other. The document then provides examples of applying the Doppler Effect equation to different scenarios involving a stationary or moving source and receiver, including calculating the frequency detected by a female whale from a sound wave emitted by a male whale as they move towards each other to mate
Pre-Cal 40S Slides November 19, 2007
The document summarizes information about the population of Calgary, Canada in 1995:
- In 1995, the population of Calgary was 828,500 and was increasing at a rate of 2.2% per year.
- It provides questions to calculate how long it would take for the population to double, when it would reach 1 million, and write the population equation as an exponential function.
Lecture22
1. The lecture covered sound waves and their properties including speed of sound in different mediums, intensity, loudness, standing waves in pipes, and the Doppler effect.
2. Honors papers are due on Friday, November 12th by email. There will be a special quiz after Thanksgiving.
3. The speed of sound is higher in helium than in air, so the fundamental frequency of a pipe would decrease if the air inside was replaced with helium.
Timmy physics #1
Timmy is riding waves at the beach and his father determines he is oscillating at 3.0 Hz. A coastguard 200m away sees Timmy's position change by 6.7 degrees between his highest and lowest points. Using trigonometry and the angular frequency, the document calculates Timmy's amplitude as 11.7m. Timmy's maximum velocity is then determined to be 221 m/s by multiplying the angular frequency by the amplitude.
Interfernce
This document discusses the phenomenon of interference, which occurs when two coherent waves superimpose to form a resultant wave of greater or lower amplitude. It defines interference and describes conditions like coherent sources, polarization, amplitudes, and path differences that must be met. Young's double slit experiment is explained as demonstrating constructive and destructive interference based on differing path lengths. Applications of interference principles are outlined, including uses in antireflection coatings, holography, laser interferometry, and optical coherence tomography.
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1. Interference occurs when two waves meet and their displacements are combined according to the principle of superposition.
2. There are two types of interference: constructive and destructive. Constructive interference occurs when displacements are in the same direction, increasing amplitude. Destructive interference occurs when displacements are in opposite directions, decreasing or canceling amplitude.
3. Young's double-slit experiment demonstrates wave interference using a laser and double slit. It produces bright and dark fringes resulting from constructive and destructive interference of the light waves.
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The document discusses the principles of interference and superposition of waves. It begins by explaining that when two or more waves meet at a point, the resultant displacement is the sum of the individual wave displacements. It then describes experiments investigating the interference patterns produced by water waves with varying wavelengths and distances between sources. The key findings are that the distance between nodes/antinodes increases with wavelength and decreases with source separation. The document concludes by explaining Young's double-slit experiment, which demonstrated interference of light waves.
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2. Thomas Young's double slit experiment provided early evidence of light's wave nature by producing interference patterns. Other experiments like thin film interference and diffraction around obstacles further supported this.
3. Albert Einstein explained the photoelectric effect by proposing light also behaves as discrete packets of energy called photons, providing evidence of its particle nature.
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This document discusses interference, which occurs when two or more waves overlap. There are two types of interference: constructive and destructive. Constructive interference occurs when waves are displaced in the same direction and amplitudes add, while destructive interference occurs when they are displaced in opposite directions and amplitudes subtract. The document provides examples of interference in light, radio, acoustic, and water waves. It describes Young's double-slit experiment, which demonstrated that light behaves as waves that can interfere and was evidence against the particle theory of light.
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This document discusses interference of light waves. It explains that Thomas Young first described the properties of light interference using a double slit experiment. The experiment showed that light behaves as waves by producing bright and dark interference fringes on a screen. Constructive interference occurs when crest meets crest or trough meets trough, creating brighter areas. Destructive interference happens when crest meets trough, producing darker fringes. For an interference pattern to be stable, the light waves must have a single wavelength and maintain a constant phase relationship.
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This document discusses light wave interference and the conditions required for it to occur. It describes how light waves from multiple sources can interfere to produce bright and dark fringe patterns. The bright fringes indicate constructive interference where wave amplitudes combine, while dark fringes represent destructive interference where waves cancel out. For interference to take place, the light sources must be coherent and monochromatic, meaning they have a constant phase difference and same wavelength.
Sound Waves
1. Sound is a longitudinal mechanical wave that propagates through a medium such as air or water by compressions and rarefactions which create regions of high and low pressure.
2. The document discusses several properties of sound waves including that frequency determines pitch, amplitude determines loudness, and speed depends on the properties of the medium.
3. Wave interference and phenomena like resonance, standing waves, and the Doppler effect are also covered as they relate to the nature and perception of sound waves.
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This document discusses key concepts about sound, including:
- Sound is caused by fluctuations in air pressure that propagate as waves. Frequency, wavelength, and speed are closely related characteristics of sound waves.
- Humans hear different frequencies as different pitches. Higher frequencies are heard as higher pitches like whistles, while lower frequencies have lower pitches like rumbling trucks.
- The loudness we perceive depends on both the frequency and amplitude of sound waves. The human ear is most sensitive to frequencies between 300-3,000 Hz, which encompasses most of the frequencies in speech.
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1. When two waves meet at a point in space, their amplitudes add vectorially. Constructive interference occurs when the path difference is an integral multiple of the wavelength, producing loud sounds. Destructive interference occurs when the path difference is an odd multiple of half the wavelength, producing soft sounds.
2. As frequency increases, wavelength decreases. This causes the positions of constructive and destructive interference to shift towards the central axis as the microphone passes through them.
3. Increasing the slit separation in a double-slit experiment doubles the fringe separation in the interference pattern. The slit width does not affect fringe separation but decreases intensity.
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The document describes harmonic waves and provides an example involving echolocation in bats. It defines harmonic waves using the equation D(x) = A sin(kx) and discusses key terms like amplitude, wavelength, wave number, and speed. For the bat example, it calculates that the speed of the sound wave is 75,000 m/s, the wave number is 0.84 rad/m, and the equation for the travelling wave is D(x, t) = 0.9sin(4.19x- 0.000126t). It also sketches the function.
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The document discusses various concepts related to waves including:
1. The amplitude of a wave is inversely proportional to its distance from the source. When amplitude doubles, distance halves.
2. Resonance frequencies of an open organ pipe are calculated based on quarter and three quarter wavelengths.
3. For three different waves, the ratios of their frequencies and wavelengths are given.
4. The detection of waves depends on the number of compressions and rarefactions detected per unit time.
5. Malus' law describes how the intensity of polarized light emerging from polarizers depends on the angle between their polarization axes.
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This document discusses principles of wave interference including:
1. The principle of linear superposition states that when waves overlap, the resulting displacement is the sum of the individual displacements.
2. Constructive and destructive interference occur when waves are in phase or out of phase, respectively, increasing or decreasing the amplitude.
3. Diffraction is the bending of waves around barriers, causing diffraction patterns from interference of diffracted waves.
4. Beats occur when two nearly matched frequencies are superimposed, producing a characteristic loud-soft pattern from their interference.
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The document describes a scenario where a person is swimming with one ear in the water and one out. A boat 50 meters away lowers its anchor, making a noise. It then asks a series of questions:
1) Which ear will hear it first? The ear underwater since sound travels faster in water.
2) What is the time difference? The ear above water will hear it 0.04 seconds later.
3) If the underwater sound has a frequency of 1500Hz and displacement of 2.0x10-11m, what is the pressure amplitude? 0.279 Pa.
4) If the person was 50m vertically above the boat instead of horizontally, would the sound be louder
Lecture22
1. The lecture covered sound waves and their properties including the speed of sound in different mediums, intensity, loudness, standing waves in pipes, and the Doppler effect.
2. Honors papers are due on Friday, November 12th by email and there will be a special quiz after Thanksgiving.
3. Key equations include the speed of sound, intensity, loudness in decibels, frequencies of standing waves in open and closed pipes, and the Doppler effect formula relating source and observer frequencies.
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Waves can be transverse or longitudinal. Transverse waves have vibrations perpendicular to the direction of travel, like water waves. Longitudinal waves have vibrations parallel to travel, like sound waves. The characteristics of all waves include amplitude, wavelength, frequency, period, and speed. Wavelength is the distance between two peaks, frequency is the number of waves passing a point per second, and speed equals wavelength times frequency.
Longitudinal and transverse waves
Waves can be transverse or longitudinal. Transverse waves have vibrations perpendicular to the direction of travel, like water waves. Longitudinal waves have vibrations parallel to travel, like sound waves. The characteristics of all waves include amplitude, wavelength, frequency, period, and speed. Wavelength is the distance between two peaks, frequency is the number of waves passing a point per second, and speed equals wavelength times frequency.
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This document discusses 2D wave interference. It explains that in 3D waves propagate in different orientations resulting in varying phase differences based on position, unlike 1D waves where phase does not change with time or position. Constructive interference occurs when waves are in phase at a point, while destructive interference is when one wave is positive and the other negative at a point. For two spherical waves, the path difference between sources and a point of interference must be an integer multiple of the wavelength for constructive interference or half-integer multiple for destructive interference. The document provides an example where the path difference between sources for destructive interference at a speaker is half a wavelength.
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This document provides an overview of wave motion concepts including wave propagation, types of waves, wave terminology, speed of transverse waves, standing waves, and resonance. Key points covered include:
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Interfernce
This document discusses the phenomenon of interference, which occurs when two coherent waves superimpose to form a resultant wave of greater or lower amplitude. It defines interference and describes conditions like coherent sources, polarization, amplitudes, and path differences that must be met. Young's double slit experiment is explained as demonstrating constructive and destructive interference based on differing path lengths. Applications of interference principles are outlined, including uses in antireflection coatings, holography, laser interferometry, and optical coherence tomography.
Creación de una estrategia digital para contribuir a la construcción de un am...
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Propuesta para el uso de redes sociales en la gestión de la seguridad entre empresas contratistas del sector construcción y energía1.5 Interference of Waves
1. Interference occurs when two waves meet and their displacements are combined according to the principle of superposition.
2. There are two types of interference: constructive and destructive. Constructive interference occurs when displacements are in the same direction, increasing amplitude. Destructive interference occurs when displacements are in opposite directions, decreasing or canceling amplitude.
3. Young's double-slit experiment demonstrates wave interference using a laser and double slit. It produces bright and dark fringes resulting from constructive and destructive interference of the light waves.
1.5 interference
The document discusses the principles of interference and superposition of waves. It begins by explaining that when two or more waves meet at a point, the resultant displacement is the sum of the individual wave displacements. It then describes experiments investigating the interference patterns produced by water waves with varying wavelengths and distances between sources. The key findings are that the distance between nodes/antinodes increases with wavelength and decreases with source separation. The document concludes by explaining Young's double-slit experiment, which demonstrated interference of light waves.
Interference and diffraction
1. Light has both wave and particle properties, though historically there were separate theories proposing one or the other.
2. Thomas Young's double slit experiment provided early evidence of light's wave nature by producing interference patterns. Other experiments like thin film interference and diffraction around obstacles further supported this.
3. Albert Einstein explained the photoelectric effect by proposing light also behaves as discrete packets of energy called photons, providing evidence of its particle nature.
Interference
This document discusses interference, which occurs when two or more waves overlap. There are two types of interference: constructive and destructive. Constructive interference occurs when waves are displaced in the same direction and amplitudes add, while destructive interference occurs when they are displaced in opposite directions and amplitudes subtract. The document provides examples of interference in light, radio, acoustic, and water waves. It describes Young's double-slit experiment, which demonstrated that light behaves as waves that can interfere and was evidence against the particle theory of light.
Interference of light
This document discusses interference of light waves. It explains that Thomas Young first described the properties of light interference using a double slit experiment. The experiment showed that light behaves as waves by producing bright and dark interference fringes on a screen. Constructive interference occurs when crest meets crest or trough meets trough, creating brighter areas. Destructive interference happens when crest meets trough, producing darker fringes. For an interference pattern to be stable, the light waves must have a single wavelength and maintain a constant phase relationship.
Interference of light
This document discusses light wave interference and the conditions required for it to occur. It describes how light waves from multiple sources can interfere to produce bright and dark fringe patterns. The bright fringes indicate constructive interference where wave amplitudes combine, while dark fringes represent destructive interference where waves cancel out. For interference to take place, the light sources must be coherent and monochromatic, meaning they have a constant phase difference and same wavelength.
Sound Waves
1. Sound is a longitudinal mechanical wave that propagates through a medium such as air or water by compressions and rarefactions which create regions of high and low pressure.
2. The document discusses several properties of sound waves including that frequency determines pitch, amplitude determines loudness, and speed depends on the properties of the medium.
3. Wave interference and phenomena like resonance, standing waves, and the Doppler effect are also covered as they relate to the nature and perception of sound waves.
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This document discusses key concepts about sound, including:
- Sound is caused by fluctuations in air pressure that propagate as waves. Frequency, wavelength, and speed are closely related characteristics of sound waves.
- Humans hear different frequencies as different pitches. Higher frequencies are heard as higher pitches like whistles, while lower frequencies have lower pitches like rumbling trucks.
- The loudness we perceive depends on both the frequency and amplitude of sound waves. The human ear is most sensitive to frequencies between 300-3,000 Hz, which encompasses most of the frequencies in speech.
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1. When two waves meet at a point in space, their amplitudes add vectorially. Constructive interference occurs when the path difference is an integral multiple of the wavelength, producing loud sounds. Destructive interference occurs when the path difference is an odd multiple of half the wavelength, producing soft sounds.
2. As frequency increases, wavelength decreases. This causes the positions of constructive and destructive interference to shift towards the central axis as the microphone passes through them.
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3. For three different waves, the ratios of their frequencies and wavelengths are given.
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The document describes a scenario where a person is swimming with one ear in the water and one out. A boat 50 meters away lowers its anchor, making a noise. It then asks a series of questions:
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2) What is the time difference? The ear above water will hear it 0.04 seconds later.
3) If the underwater sound has a frequency of 1500Hz and displacement of 2.0x10-11m, what is the pressure amplitude? 0.279 Pa.
4) If the person was 50m vertically above the boat instead of horizontally, would the sound be louder
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1. The lecture covered sound waves and their properties including the speed of sound in different mediums, intensity, loudness, standing waves in pipes, and the Doppler effect.
2. Honors papers are due on Friday, November 12th by email and there will be a special quiz after Thanksgiving.
3. Key equations include the speed of sound, intensity, loudness in decibels, frequencies of standing waves in open and closed pipes, and the Doppler effect formula relating source and observer frequencies.
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Waves can be transverse or longitudinal. Transverse waves have vibrations perpendicular to the direction of travel, like water waves. Longitudinal waves have vibrations parallel to travel, like sound waves. The characteristics of all waves include amplitude, wavelength, frequency, period, and speed. Wavelength is the distance between two peaks, frequency is the number of waves passing a point per second, and speed equals wavelength times frequency.
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Waves can be transverse or longitudinal. Transverse waves have vibrations perpendicular to the direction of travel, like water waves. Longitudinal waves have vibrations parallel to travel, like sound waves. The characteristics of all waves include amplitude, wavelength, frequency, period, and speed. Wavelength is the distance between two peaks, frequency is the number of waves passing a point per second, and speed equals wavelength times frequency.
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2019 PATTERN.
在线办理(salfor毕业证书)索尔福德大学毕业证毕业完成信一模一样
学校原件一模一样【微信：741003700 】《(salfor毕业证书)索尔福德大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
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)
如果您处于以下几种情况：
◇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
The cost of acquiring information by natural selection
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...Scintica Instrumentation
Targeting Hsp90 and its pathogen Orthologs with Tethered Inhibitors as a Diagnostic and Therapeutic Strategy for cancer and infectious diseases with Dr. Timothy Haystead.Micronuclei test.M.sc.zoology.fisheries.
Current Ms word generated power point presentation covers major details about the micronuclei test. It's significance and assays to conduct it. It is used to detect the micronuclei formation inside the cells of nearly every multicellular organism. It's formation takes place during chromosomal sepration at metaphase.
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.
Direct Seeded Rice - Climate Smart Agriculture
Direct Seeded Rice - Climate Smart AgricultureInternational Food Policy Research Institute- South Asia Office
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...Advanced-Concepts-Team
Presentation in the Science Coffee of the Advanced Concepts Team of the European Space Agency on the 07.06.2024.
Speaker: Diego Blas (IFAE/ICREA)
Title: Gravitational wave detection with orbital motion of Moon and artificial
Abstract:
In this talk I will describe some recent ideas to find gravitational waves from supermassive black holes or of primordial origin by studying their secular effect on the orbital motion of the Moon or satellites that are laser ranged.Compexometric titration/Chelatorphy titration/chelating titration
Classification
Metal ion ion indicators
Masking and demasking reagents
Estimation of Magnisium sulphate
Calcium gluconate
Complexometric Titration/ chelatometry titration/chelating titration, introduction, Types-
1.Direct Titration
2.Back Titration
3.Replacement Titration
4.Indirect Titration
Masking agent, Demasking agents
formation of complex
comparition between masking and demasking agents,
Indicators/Metal ion indicators/ Metallochromic indicators/pM indicators,
Visual Technique,PM indicators (metallochromic), Indicators of pH, Redox Indicators
Instrumental Techniques-Photometry
Potentiometry
Miscellaneous methods.
Complex titration with EDTA.
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
11.1 Role of physical biological in deterioration of grains.pdf
Storagedeteriorationisanyformoflossinquantityandqualityofbio-materials.
Themajorcausesofdeteriorationinstorage
•Physical
•Biological
•Mechanical
•Chemical
Storageonlypreservesquality.Itneverimprovesquality.
Itisadvisabletostartstoragewithqualityfoodproduct.Productwithinitialpoorqualityquicklydepreciates
Authoring a personal GPT for your research and practice: How we created the Q...
Thematic analysis in qualitative research is a time-consuming and systematic task, typically done using teams. Team members must ground their activities on common understandings of the major concepts underlying the thematic analysis, and define criteria for its development. However, conceptual misunderstandings, equivocations, and lack of adherence to criteria are challenges to the quality and speed of this process. Given the distributed and uncertain nature of this process, we wondered if the tasks in thematic analysis could be supported by readily available artificial intelligence chatbots. Our early efforts point to potential benefits: not just saving time in the coding process but better adherence to criteria and grounding, by increasing triangulation between humans and artificial intelligence. This tutorial will provide a description and demonstration of the process we followed, as two academic researchers, to develop a custom ChatGPT to assist with qualitative coding in the thematic data analysis process of immersive learning accounts in a survey of the academic literature: QUAL-E Immersive Learning Thematic Analysis Helper. In the hands-on time, participants will try out QUAL-E and develop their ideas for their own qualitative coding ChatGPT. Participants that have the paid ChatGPT Plus subscription can create a draft of their assistants. The organizers will provide course materials and slide deck that participants will be able to utilize to continue development of their custom GPT. The paid subscription to ChatGPT Plus is not required to participate in this workshop, just for trying out personal GPTs during it.
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
20240520 Planning a Circuit Simulator in JavaScript.pptx
Evaporation step counter work. I have done a physical experiment.
(Work in progress.)
The debris of the ‘last major merger’ is dynamically young
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
Recently uploaded (20)
Basics of crystallography, crystal systems, classes and different forms
Basics of crystallography, crystal systems, classes and different forms
The cost of acquiring information by natural selection
The cost of acquiring information by natural selection
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...
Applied Science: Thermodynamics, Laws & Methodology.pdf
Applied Science: Thermodynamics, Laws & Methodology.pdf
aziz sancar nobel prize winner: from mardin to nobel
aziz sancar nobel prize winner: from mardin to nobel
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...
Compexometric titration/Chelatorphy titration/chelating titration
Compexometric titration/Chelatorphy titration/chelating titration
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
11.1 Role of physical biological in deterioration of grains.pdf
11.1 Role of physical biological in deterioration of grains.pdf
Authoring a personal GPT for your research and practice: How we created the Q...
Authoring a personal GPT for your research and practice: How we created the Q...
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
20240520 Planning a Circuit Simulator in JavaScript.pptx
20240520 Planning a Circuit Simulator in JavaScript.pptx
The debris of the ‘last major merger’ is dynamically young
The debris of the ‘last major merger’ is dynamically young
Interference in sound waves
- 1. Interference in sound waves PHYS 101 LO8
- 2. Mummy whale (whale A) and daddy whale (whale B) went for a swim and lost their baby whale (whale C). The two whales decide to call out to their child. All three whales are stationary. Whales A and B are both calling towards whale C with a frequency of 17Hz. The sound waves produced by both whales start at the node (so the sound waves can be represented by the sine curve). The distance between whales B and C is 1090.25m. The speed of sound in ocean water is 1513m/s. (Assume that no damping occurs).
- 4. In this case, what would the distance between whales A and B have to be so that: 1. their calls cancels out as it reaches the baby? 2. their calls combine to be the loudest possible when it reaches the baby whale? There will be multiple possible answers so express your answer in a general algebraic form.
- 5. Answers Q1: 44.5x m (where x is an integer) Q2: 89x m (where x is an integer)
- 6. Explanation for Q1 First we need to determine wavelength using equation λ=v/f λ=1513/17=89m
- 7. Then we can draw the following diagram showing the sound waves of the whales. The blue line represent whale B’s sound waves and the pink lines represents whale A’s sound waves. The resultant wave is represented by the black line. In order for the sounds to cancel (destructive interference), whale A must be half a wavelength apart from whale B, or a multiple of this value. Since half a wavelength is 89/2=44.5m, the distance between A and B needed for destructive interference to occur is 44.5x m (where x is an integer).
- 8. Explanation for Q2 In order for constructive interference to occur when the sound waves reach whale C, the sound waves produced by whales A and B must completely overlap each other. We can find out how far whale B is from whale C in terms of λ : 1090.25/89=12.25 (whale C is 12.25 wavelengths away from whale B)
- 9. It turns out that if whale B’s sound wave starts at a node, then 12.25 wavelengths later, the wave will reach whale C at an antinode. Again in this diagram the blue line represent whale B’s sound waves and the pink lines represents whale A’s sound waves, and the resultant wave is represented by the black line. This means that as long as whale A is one (or a multiple of one) wavelength/s away from whale B, their sound waves will double in amplitude when it reaches whale C, as seen in the diagram. So the distance needed between whales A and B for constructive interference to occur is 89x m (where x is an integer).