Questions related to Sound
Acoustic inside the mosque is affected by different creteria such as form, space design , material, insulations, AC,...
What do you think?
If you fail in science, please provide me some sound advise.
In 1944, a previously unknown phenomenon of sound propagation over ultra-long distances was recorded. They write about 5 thousand kilometers. In accordance with calculations using empirical formulas, the maximum range of sound propagation is no more than 150 km. In accordance with the theory of propagation of infrasound, 200 km is obtained. What could be the explanation for propagation over such large distances?
The intensity of external sound incident on the glass is partly reflected and partly transmitted to the interior.
The question is then how to maximize the reflected part and therefore minimize the internally transmitted part?
During commissioning activities a static equipment was subject to sever vibration and high acoustic sound vibration. Although operated within the design normal operating parameters.
I'm preparing a model related to the phenomenon of leak detection by acoustics in gas pipeline . The case is transient encountering injecting of an acoustic wave signals in the domain . After invistigation of results , i found that the results are mixed with reflected wave coming from the end of the pipe.So i need to eliminate the reflected waves by means of end condition that can absorbes all the reflected waves . NOTE (I already used perfect matched layer for frequancy steady state studies but it doesn't work with transient studies ) .
thanks for your supports .
In order to assess sound performance of a building facade element (wall, window, louver, glazing,...) and its ability to mitigate airborne exterior noise into the reception room , i found different noise descriptors :
*weighted apparent sound reduction index R'w.
*weighted standardized sound level difference Dn, Tw
i want to know when to use each one of them.
am comfused because i think they both have the same sound insulation procedure, which is mentioned in EN ISO 717-1.
Can we study an interaction in above stated question through RBD factorial experiment?
I know that we can do it in a convenient way by adopting Split plot design or Strip plot design but experimental site dimensions don't allow for such layout.
So please don't try to suggest that Split plot or Strip plot is the way.
Just comment whether conducting this field trial in RBD factorial will be statistically sound or not.
I already made the experimental setup of impedance tube for the same construction. Do I have to validate it?
I remember coming across a study or article a few years ago, the main findings were that people tended to believe a research finding more if neuroscience terminology was used compared to traditional psychology terms. For example, when comparing the statements "the brain responded to the stimulus faster ..." versus "participants responded to the stimulus faster...", people tended to believe the former statement more. However, I cannot find the research article anywhere, and at this point am unsure if I made a mistake in my memory. Does this sound familiar to anyone?
I understand there will be exact multiple of fundamental frequency based bearing rotation with respect to fundamental, based on gear rotation with respect to fundamental. But what exactly means for multiples of bearing rotations, multiples of blade passes like 1x, 2x, 3x etc.,
In my model, as I increase the grid size, the results are close to observed values. But the problem is that the model is small and larger grid size means the number of grid sizes across the width is very low (maybe only 7 or 8). Am i missing something here?
I'm doing a thesis that is related to sound production of crabs. Various crabs such as Ghost crabs and Dungeness crabs produce sound when they feel vulnerable. In my case, my thesis focuses on the mangrove crab Scylla Serrata. But due to travel restrictions due to Covid-19 situation I'm not able to perform my own experiments. I could not find any resources that were dedicated to sound production of Scylla Serrata. So, I wanted to know if Scylla Serrata produce sound when they feel vulnerable or before other crabs cannibalize them.
I have been searching for a real Master for about 30 years and till now I have met a number of so called fake masters who misguide you in the divine name of Light and Sound, but no one could give any inner experience. I have met Ishwar Puri, Ching Hai, Darshan Singh, Thakur Singh, Pier Franco Marcenaro Paul Twitch , Sadhguru, Radha Swami Satsang Byas today, Ravi Shankar, Niraankari, Divya Jyoti Jagran Sansthan, Ram Pal and many like these. They all say that sit in the meditation and you will get some experience as per your past karmas or you will get at the time of death. Though it is said by the Real Masters of past that the Real One will give you some first hand experience as he is connected to God and God is manifested in him. It is not possible that if someone connected to God can not give you any experience. He is like a sandalwood tree, if it does not give you anything, at least you get its fragrance.
I just want to confirm "Is there anyone in this world who has seen Inner light and heard Inner Sound and met with a Real Master who has blessed him with these Divine Things?"
I have to perform a localization of a underwater autonomous vehicle (UUV) and for that purpose have a couple of sensors available on board. I know that ultrasonic (Sonar) sensors perform well in the water. I also have IMU and Monocular Camera available .So my question is , Visual-inertial localization better solution for underwater compare to Sonar(ultrasound)? So thinking of Fusion of the IMU and and Monocular camera to be used for the localization and depth calculation instead of ultrasound. Which solution is more appropriate and have more advantages?
Experimental results of the Sound absorption coefficient of material have mostly been found to be in good terms with the Theoretical models. But the calculations look confusing. With imaginary terms and differential equations.
Are there any simplified calculations and methods for theoretical modeling in acoustics?
How do sound waves travel through a barrier? A sound wave is the result of compression and rarefaction of gases. This pressure difference makes the air molecules oscillate. [Fig 1]
When sound waves hit the plane wall they reflect. I am considering the same thing for the pressure difference. But when the wave hits the barriers like as shown below image. How will be the pressure distribution? Will it follow the same compression and refraction pattern? Or it will be a high-pressure region at the corner? [fig 2]
It is widely agreed that any sustainable development shall be based on sound scientific findings and innovations. The researchers are working in very difficult to develop or promote these solutions. Unfortunately, on the other side, policy makers and executive are working without any clear and stable links with researchers and scientists. This situation create a gap between scientists and policy makers and leading to establishment of unsuccessful and unsustainable development projects in the developing countries.
I need to test Sound Insulation of concrete Panels (300 mm * 300 mm * 50 mm). May I know about what kind of arrangement need to conduct this test at laboratory
I would like to measure with a microphone the surface sound pressure on a steel plate. A transducer is attached to the other side and operates at fixed frequencies between 20 and 40kHz. The idea is to see how the vibration is distributed along the plate, where is the maximum ad minimum etc. I plan to divide the steel plate in a sort of coordinate system, where measurements are made at each point. The microphone will be connected to an oscilloscope, peak to peak signal will be recorded and then converted to sound pressure level (SPL).
Do you think this would give any meaningful results? I have rather limited knowledge in acoustics and sound propagation so any sort of tips and suggestions are welcomed.
I am examining a Masters dissertation and 10% of the sources consulted are from the supervisor - the supervisor's work cannot be regarded as seminal or benchmark on this topic.
I'd like to supply a sound velocity measurement setup for the synthesized glass samples in our lab. For this, is there anyone who can help me to find out a supplier? Also, any example setups in your labs will be highly appreciated.
Thanks in advance for your time-consuming.
Pearson's Q-Global is expensive, and does not have Indian versions of tests or norms!
a. Are there cheaper, culture-fair online tests that are psychometrically sound, for research?
b. What are people's experiences of adapting existing neuropsych tests to videoconferencing for research purposes?
Thanks in advance!
I am looking for a system that measures insect activity over a natural area such as a pond. Is there anything? I was thinking similarly to sonar to measure bird migration.
Hi everyone, I have attached a picture of sketch for FCU duct-borne noise calculation. There are 2 questions in the sketch or as shown below,
Q1: Do we do power division for the FCU sound power when calculating duct borne noise for path 1 and path 2? Any published material for referencing specifically for this?
Q2: SPL at receiver = Path 1 + 3dB or Path 2 + 3dB ?
I'm welcoming any advise and comments towards it. =)
Any human construction is not a perfect number generator. Any lottery drum cannot have a perfect design. Therefore, several mathematicians succeeded!!!
There are a lot of examples. For example:
Incredible Spanish Casino Winning Strategy
Gonzalo Garcia-Pelayo was not only a mathematician. He was able to develop mind-blowing powers of observation. When Gonzalo realized that the calculations and actual results did not add up, he began to look closely at roulettes. In the end, the mathematician found the answer. He noticed that the shiny surface of the roulette wheel reflects light unevenly. The Spaniard calculated the approximate slope from the glare. To detect unstable rotation, it was necessary to count the revolutions. If the tape made a different number of turns to the left and to the right, the drum was defective. After collecting statistics, it was possible to determine the "lucky" numbers.
Garcia-Pelayo is not the first player to beat the casino. He borrowed the technology from Joseph Jagger. The grandfather of the famous musician Mick Jagger was the first American to cheat the roulette wheel. Joseph worked as an engineer in a cotton mill. Once he realized that casino roulettes simply cannot have a perfect design. To test the theory, he asked five friends to go to the casino and watch the roulette wheels. As a result, Jagger identified nine winning numbers.
The Spanish court issued a non-appealable decision. Moreover, the judge advised casino owners to better monitor their equipment. The Spaniard was not recognized as a fraud, as the prosecutors wanted. The money won entirely remained with the former sound engineer. Gonzalo's rich roulette experience and hours spent in the casino was a wonderful experience. Together with his children, he opened a gambling analysis agency. The Spaniard also conducts an expert assessment of virtual casinos.
Can someone please provide me experimental values of the longitudinal or Transversal sound speed for Single Crystal Tantalum and Copper, along with the directions (100), (110), and (111)? I have limited access to journals, and I'm no longer affiliated with a University. There is a paper titled Elasticity of BaFCl single crystal under hydrostatic pressure, which tells elastic constants are related to the speed of sound. It is also well-known people in Geophysics use the speed of sound to find the elastic constants (inverse process) https://www.hindawi.com/journals/mpe/2016/6762076/
Anyways, I need the experimental values of the speed of sound for the crystals mentioned above. I'm trying to publish a final paper of an algorithm for finding the speed of sound for any K direction and a given pressure P . It would be awesome if the results I obtain are close to the experimental data available. I presented part of my work a long time ago at https://meetings.aps.org/Meeting/TSF16/Session/H4.4
We are using a horn-type ultrasonic transducer for cavitation and cleaning purposes.
We experimentally found that the cavitation effect and cleaning effectiveness were decreased when input power was higher than a certain value.
The sound pressure measured by the hydrophone showed a periodic wave pattern when we applied proper input power, but it showed an irregular wave pattern when the input power is high (maximum value of sound pressure was high, but RMS value was low).
I have two questions
1. Does cavitation is promoted when the acoustic field shows a uniform and periodic pattern?? (even the maximum sound pressure is lower). Why??
2. Does the tip of the ultrasonic horn irregularly vibrate when high power was applied?? If not, why does the measured sound pressure showed an irregular pattern??
What is a real-life example of the inverse relationship between frequency and (power/energy/pressure)?
I am just really confused about how to correlate Power/Energy/ Pressure in ultrasound towards its frequency. Based on what I have been researching, Ultrasonicator usually uses a high frequency with low (Power/Energy/Pressure) and otherwise, the low frequency with high (Power/ Energy/ Pressure). Why do I mention power/energy/ pressure? it is because apparently, they are related. Power is related to pressure in the Intensity equation where it seems to be the pressure amplitude square (based on the equation), while energy is related to amplitude (kinetic energy). I would really appreciate it if somebody can help me explain why there is an inverse relationship between frequency and (power/energy/pressure) and surely give me a real-life example about it. If the relationship between frequency and pressure appears to be independent, please give me a real-life example of it.
I'm beginner at comsol modeling. I tried 2D modeling of wave propagation, PZT simulation in time domain by comsol , But I couldn't make it. I attached a file which I tried on.
A menudo un investigador se basa en los instrumentos exteriores o en el corpus de datos generados por una cultura particular. ¿Es suficiente utilizar los criterios establecidos para reconocer y validar una publicación, conducta, sociedad , cultura o espiritualidad como buena?. Buena, entendiendose como válida, saludable a nivel universal y duradera. El dialogo constructivo es necesario para la consolidación de una realidad, pero ¿ Y si los que conforman este diálogo no tienen en sí mismos la visión correcta?. Ejemplos de ello son los grupos culturales y de investigación que no han mantenido una base etica y espiritual correcta (Eugenesias, Investigacion cruel con animales, periodos historicos violentos, etc.). ¿ Es necesario revisar el propio sistema de valores no como una base de creencias sin como guia de conducta en la praxis diaria?
Often a researcher relies on external instruments or the body of data generated by a particular culture. Is it enough to use the established criteria to recognize and validate a publication, a conduct, society, culture or spirituality as good? Good, understood as valid, healthy on a universal and lasting level. The constructive dialogue is necessary for the consolidation of a reality, but what if those who make up this dialogue do not have the right vision in themselves? Examples of this are cultural and research groups that have not maintained a correct ethical and spiritual basis (Eugenics, Cruel research with animals, violent historical periods, etc.). Is it necessary to review the value system itself not as a basis of beliefs without as a guide to behavior in daily practice?
I am building a 5KV DC low current power supply using a full wave rectifier setup (not a bridge rectifier) and a shell type 5kV step up transformer. But cannot operate it more than 2.5kV as the transformer produce humming sound. I am not sure whether the value of C (~17microFarad)and R(~5MegaOhm) I am currently using is correct. So how does one determine the value of R and C, and also the component required for smoothing the output voltage to obtain pure DC.
Have your manuscript been rejected by these so called reputable International journals because its addresses a local issue or content? I have and a couple of my friends. But have you noticed that some scientists are allowed to get away with it. For instance a dairy problem in USA will be described as such, and a methodology will be sought to solve it and results presented. However, work from other regions of the world would be turned down because it does not sound like it will be beneficial to other part of the world or of no interest to other scientists.
How many times have you read a article which may not necessarily be applicable to you lab, country or region; but still find it interesting? I think this kind of assessment of submitted manuscript is unfair and discriminatory and should stop.
I am looking for a scale to measure psychological health, sort of like the Brief Symptom Inventory or the General Health Questionnaire, both of which are excellent but pretty costly for a student like me. Ideally I would want a tool that is in English, can be used on a young adult population, psychometrically sound AND has multiple domains or subscales (like these both do). I don't want to use different scales to make a composite dependent variable.
Any leads or ideas would be greatly appreciated.
Sound boom happens when the speed of of a flying object exceeds that of the sound traveling in air. It's not easy to generate such a linear speed. However, this can be relatively easily generated by rotational motion. In other words, if we rotate an object, let's say a disk, fast enough, the speed of disk at the edge can easily be supersonic.
So here are my questions: Has anyone tried similar experiments? What happens when the speed at the edge of the disk exceeds that of sound?
Happy New Year. I wish everybody a prosperous New Year.
I'm thinking of a project for checking the sound (phonetics) that will lost or promoted while switching from one set of alphabet to another. For example switching from Arabic letters to Latin in Turkey; does the set of Latin letters saved all Turkish phonetics (sound)? What is the advantages and/or disadvantages of such switching?
Did such work carried out anywhere?
Voy a comenzar a hacer una serie de declaraciones controvertidas sobre el manejo forestal. Estas no son declaraciones que necesariamente puedo defender, pero les agradezco y me dan argumentos a favor o en contra y con citas de buena ciencia y buen juicio. La buena ciencia y experiencia pueden probar hipótesis. El respeto es apreciado y por favor, dejen de lado la bilis cuando respondan.
Sea tan profesionales como lo requiera el ejercicio. La primera afirnación es:
LA MAYORÍA DE LAS ESPECIES UTILIZADAS EN LA REFORESTACIÓN A GRAN ESCALA EN EL MUNDO SON MONOCULTURAS NATURALES EN SUS SITIOS DE ORIGEN
Por favor responde y comparte. Recopilaré las respuestas y luego las compartiré en un documento sobre el tema, reconociendo los aportes de todos los que hagan comentarios. Esperare un mes para ver sus reacciines antes de poner la siguiente afirmación.
Gracias oor anticipado
Dr. Ronnie de Camino Velozo
I am going to start making a series of controversial statements about forest management. These are not statements that I can necessarily defend, but I thank you and give me arguments for or against and with quotes from good science and good judgment. Good science and experience can test hypotheses. Respect is appreciated and please set bilis aside when responding. The first statemet is:
MOST OF THE SPECIES USED IN BIG SCALE REFORESTATION IN THE WORLD ARE NATURAL MONOCULTURES IN THEIR SITES OF ORIGIN
Please respond and share. I will collect the responses and then share them in one document, recognizing the contributions of all the ones that make comments. I will wait one month for your reactions before putting the next statement.
Thank you very much in advance.
Dr. Ronnie de Camino Velozo
I am planning my hierarchical regression model, and am stuck on how to order my variables in different blocks. I have currently planned to add covariates in ordered from those expected to have the least to the most attenuating impact on the effect estimate from the literature.
Secondly, I have added my proposed moderators in together in the final block, and then plan to add interaction terms one-by-one afterwards.
Does this sound plausible? I gather different studies use different approaches.
Thanks a lot,
Fellow researchers, I would like to ask you, does anyone know how to express the sound absorption coefficient in the complex plane? The picture is as the file.
Hello, may I know how to compute the overall sound absorption coefficient of 2 or more items together (coefficient for overall system)?
1. item 34 on the surface of item 28?
2. item 12 on the surface of item 38?
Kindly refer to the attachment to get the item.
How the sound absorption coefficient of an acoustic absorber can be calculated using the thermo-viscous module in Comsol? When I tried to calculate the sound absorption of the Helmholtz resonator, it shows lower absorption values than the study done using the narrow region acoustics model. Compared to the thermo viscous model, the narrow region model gives better matching with the analytical model. Can anyone please help in this regard? What are the boundary conditions we have to take care of when we using the thermo-viscous module?
The numerical model and results are attaching here. Thanks in advance.
We need technology to help and
Reinforcement Teaching skills. Should we really direct our students in the right direction?
And what is the effective and sound way to use technology in education in order to prepare students to face society and the world around them?
May be it will sound anecdotal, but in my country, during an outbreak of chikungunya, we have seen the lowest incidence of dengue and vice versa.
May be some ascertainment issue, may be prioritizing issues, I am not sure. But I am more interested to find out from virologic or ecological view point for an explanation it. Thanks
I listen to music and it is very rare for me not to have some background music when I am busy (unless I am concentrating on something that takes my whole attention).
But some people listen to non-music programs on the radio, for example, or have the television on in the background.
What do you favour?
I'm curious to know if there are any audio signal processing algorithms existing for estimating the impact of collision through processing the sound generated by the impact
Human binaural sound source localization is complex.
ITD (Interaural Time Differences) and ILD (Interaural Level Differences) are 2 main clues used by humans for binaural sound source localization, but other clues must be used to explain obtained results on experiments trying to evaluate human performance in binaural sound source localization, such as:
- performance difference between the setup where the sound source position/orientation is fixed and (1. the listener can voluntarily move its head) and (2. the listener is not allowed to move its head),
- performance difference between (1. individualized HRIRs) and (2. non-individualized HRIRs),
- performance difference between (1. BRIRs of anechoic rooms) and (2. BRIRs of semi-reverberant rooms)
- performance difference between (1. BRIRs recorded in a room and reproduced, with non-isolating headphones, in the same room) and (2. BRIRs recorded in a room and reproduced in another room which has different acoustic characteristics) (not sure about that, but it is my guess),
I know that, biologically, human auditory system does
1) some kind of wavelet analysis, similarly to a CNN in Machine Learning, applied independantly to left and right ear signal, then
2) some kind of (left-right) multi-band temporal encoding (Spike Neural Network) and analysis (multiple delay lines + coincidence detectors), somehow similarly to a MLP with positional encoding in Machine Learning.
Because temporal information between left/right channels is required, I wonder why not much studies are using dirac impulses as sound stimuli, which have the interesting property of guaranteeing the non-distorsion (or destruction) of temporal clues ?
Why, instead of dirac sound stimuli, most of the experiments are based on other sound stimulis, such as short burst noises, human voices, or any other sound stimulis ?
In particular because in my opinion:
1) short burst noises doesn't preserve all -potentially useful- temporal clues (I think it only somehow preserves clues that would be based on signal amplitude envelope due to the short windowing of the stimuli....),
2) human voices or other sounds (if recorded in anechoic environment and with a unique mono-channel microphone) may preserve all temporal clues, but may not have full-spectrum energy.
Are there any technical reasons, except maybe the difficulty to produce a loud enough dirac impulse with headphones, that may justify the non-usage of dirac impulses as sound stimuli in binaural sound source localization experiments ?
Thank you very much !
A relação entre o ruido urbano e a forma como os diversos atores sociais com ele se relacionam tem vindo a ser negligenciada dentro do seio académico (em especial dentro de áreas como a sociologia, antropologia e estudos urbanos). Por certo que, dentro do horizonte das ideias, ligada a uma relação bilateral entre as paisagens socialmente construidas e a evolução das cidades, existem algumas produções (como a de Carlos Fortuna; Augoyard e Torgue; Halligan e Hegarty; entre outros), mas ainda existe alguma falta no sentido da normalização (ou naturalização de G. Simmel) entre os sons e o meio urbano.
Assim, gostaria de perguntar se, dentro dos constrangimentos que a globalização permite, conhecem mais produções dentro desta área?
Obrigado pelo tempo.
A la parution d'un article, le chercheur trouve t-il sa satisfaction dans les recommandations, citations et lecture de son article par ses pairs ou s'attend-il à ce qu'on se sert de ses visions pour faire face au problème rencontré.
La gamificación es una técnica de aprendizaje que traslada la mecánica de los juegos al ámbito educativo-profesional con el fin de conseguir mejores resultados, ya sea para absorber mejor algunos conocimientos, mejorar alguna habilidad, o bien recompensar acciones concretas, entre otros muchos objetivos.
My design contains three parts.
A silicon rubber membrane is placed between upper and lower part.
I want to calculate sound transmission loss by using comsol Multiphysic.
There are lots of module inside Acoustic section.
Which module will be suitable for this??
I have a data set of measured an air flow signals representing breath waveforms, each is of 6 seconds duration. The signal was sampled at a 100 sample/second. There is an interest to study the spectral characteristics of these breathes using the time-frequency analysis since the breath contains sound frequencies between 20Hz-10Khz. However, the 100 sample per second rate is way too small to meet the Nyquist Frequency for which the sampling rate should have been at least 20Khz. In such case, is there still any chance to perform any useful time-frequency analysis on his signal? Does this signal still include any useful spectral characteristics?
Thanks in advance.
I measured brain responses from 20 subjects to 5 different sound stimuli. Stimuli were presented at 3 different intensity levels in one ear at a time. One of the stimuli is like a "standard" and four other stimuli have different characteristics. What I am interested in is to find out which stimuli (of other four) produce a larger response compared to the "standard" stimulus at each intensity level.
I tried to fit mixed model to my data like this:
lme <- lmer(Amp ~ Level*StimType +(1|Subject) +(1|Ear), data = D);
and now I would like to make a multiple comparison and I do it in this way
lsmeans( object=lme, pairwise ~ Level * StimType, adjust= "tukey")
but I just want to compare these four stimuli with the "standard" stimulus at each intensity level, I do not need the comparison between these four stimuli. I can of course ignore them, but is there a more beautiful way to make a comparison I want?
And another question is about the Bonferroni correction. I tried to find information about the necessity of Bonferroni (or Holm, etc.) in mixed models, but I could not find something. Should it be applied? If yes, is it built into the model or should I apply it manually?
Thanks in advance
Test a gas stove at, e.g., five different powers. Record the acoustic signal and the sound pressure level [this latter will not be a precise value, but their ratios will be]. For the acoustic signal, you can use, e.g., the Spectroid or Spectrogram app (there are a lot of apps out there to do FFT on the microphone signal). For the sound pressure level, you can use, e.g., the Andro sensor app.
need recommendations for above statement..
I am doing a research about glass and conventional cockpits. Research question: " Is there a workload difference between cocpits? I am gonna use 30 pilots in my research. Which one is more sound statistically: 30 pilot flying same pattern on each cockpit then compare these total 60 data or 15 pilot flying same pattern on glass cockpit and 15 pilot flying same pattern on conventional cockpit then compare these total 30 data?
We know that there are certain materials in the world that can be used to absorb sound or reflect sound or signal . But what if , there any material in which sound or signal which can adsorbed?
Is it possible to adsorb it?
I am looking for a good sound generator for fear retrieval and extinction experiments, can anyone suggest a cheap, reliable and good one, please?
It should be able to generate 2.5, 5 and 7.5kHz and also need to generate 30-75dB (roughly on this range).
thank you so much in advance,
My study topic is jet mixing noise. I am given a velocity field in Vx, Vy, Vz at x and y coordinates, and would like to find the pressure field, and from that, find the sound level (or at least something related to sound). How should I proceed?
Any article submitted to any journal goes under review if found suitable and within the scope of that journal. However, after reviewers completed their assignments, the authors do respond to queries raised by such reviewers, it could be once or a series of reviewer-author responses. Finally, the editor in Chief finalizes the decision. In Elsevier, particularly, before this happens, the status of the article shows Decision in Process. My question is how long does it take for this status to change under an ideal situation? And If it took more than the expected time, what should the corresponding author(s) suppose to do?
I hope to get sound and convincing responses from eminent researchers and editors across the platform.
Physically measuring depth of water in a borewell is very difficult. First we need to dissemble the cap of the borewell. Then we need to allow measuring tape inside borewell which is very tedious.
There are SONAR based technologies for this purpose. Based on the time required for sound waves to reflect from the water level, they determine the depth of water level.
How accurate are these methods?
I am interested in input from an expert with a PhD in the area of K-12 students' self-regulation development related to their school mobility experiences. I am studying this topic for my dissertation and would love to obtain additional empirical research or sound experiential insights from this research community. Thank you!
Staggered grid finite-difference (FD) methods are widely used for elastic wave equation modelling because of their high computational efficiency, smaller memory requirement and easy implementation. I am looking for the mathematical foundation for higher order (8th) of finite difference staggered-grid method on 2D P-SV elastic wave propagation.
Hi all, I proceed with nucleic acid gel electrophoresis recently several times, but a wried phenomenon is they always melted after running over 30min.
My gel concentration is 1% percentage Agarose, parameters are 90V, 400mA. If the running time is 20min, the gel will safe and sound, but once I prolong the running time, the gel will be melted in the TAE buffer.
Does anyone meet with such situations?
Does anyone have a step-by-step example of an underwater Active sonar for detection problem that explains the data preprocessing process well and practically?
Kind of active sonar : FARSOUNDER – FS3 SONAR (forward-looking sonar)
Hola, soy educador social. En mi disciplina se trabaja mayormente desde la educación no formal con fin social; por ejemplo: en centros de menores, residencias de personas con diversidad funcional, ONGDs, asociaciones educativas, etcétera. Cabe detallar que incluso estas acciones educativas cooperan a veces con la educación formal. Pienso que son contextos importantes tanto para practicar la educomunicación como para investigar sobre la misma, ya que así se potencia la finalidad social.
Por lo general, según mi experiencia en estos contextos y de búsqueda de documentos científicos, percibo que existen escasas acciones educomunicativas actualmente.
Espero vuestras interacciones,
Un saludo desde Córdoba (España)