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0answers
19 views

The number of particles in PDG, and what the data includes

I checked here for computer-readable PDG particle data, and count about 174 unique particle IDs there, which seems like an awfully small number of particles to be "every particle type there is in the ...
0
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0answers
18 views

What Dimensionality Reduction method I can follow on a dataset that has Physics Parameter?

I am trying to model data related to Locomotive Train. We have a various set of parameters and we have the possibility to generate a few more parameters from this. Our model is currently using a lot ...
2
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1answer
29 views

Self-regulated stepwise evolution

Are there empirical examples of self-regulated punctuated evolution (with time)? This is when a quantity grows over time in a stepwise fashion, with each growth step having less amplitude than the ...
2
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2answers
34 views

Uncertainty for a given value

While including a data table for a lab report, the guidelines asked to include an uncertainty value for each raw data. In this particular lab where we used slotted masses the masses were already given ...
1
vote
1answer
53 views

How do LF Radio waves send data?

Excuse me I am a complete beginner. If LF radio waves are sent with let’s say frequencies of 100 kHz, how can data be modulated to that signal considering the signal is so long? For example, how can ...
2
votes
1answer
49 views

What's the mass of $D_1(2430)^{\pm}$?

What's the mass of $D_1(2430)^{\pm}$? The standard reference http://pdglive.lbl.gov/ParticleGroup.action?init=0&node=MXXX035 only shows the data for $D_1(2430)^0$ but not for $D_1(2430)^{\pm}$. ...
0
votes
1answer
88 views

Double slit experiment/ fitting data to complicated sine function and vice versa [closed]

As part of analysing the double slit experiment, I've recorded position values for a number of minima and the central peak position. Also, I've conducted a single slit experiment (with unknown width)...
2
votes
2answers
57 views

What does a double parenthesis in a quoted value ─ like e.g. 157(3)(3) ─ mean?

Sometimes, in journal articles, the author writes a number followed by two parenthesis. For example, $157(3)(3)$, where it seems that the first parenthesis shows uncertainty in the last digit (here, $...
2
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1answer
29 views

What is the solar wind speed as function of distance from the Sun?

Someone must have calculated at least a "zero-order approximation" of the behavior of solar wind speed, density, and pressure as a function of distance from the Sun, but the heck if I can find it. ...
2
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0answers
77 views

Where to find databases from physics experiments?

In some lecture I want to write about data analysis in physics I want to show some real uses of data analysis tools in the analysis of data from real experiments. I tried to search but I couldn't find ...
0
votes
1answer
40 views

Measured Earth local gravity

I am looking for measured data of the local gravity on Earth. I know this website (https://www.ptb.de/cartoweb3/SISproject.php). The idea is nice but it looks a bit old and I would like to have an ...
1
vote
1answer
34 views

File with particle decay data [closed]

Does anyone know of a computer parsable file that has basic physics and decay data for (quite many) observable particles, such as mesons, barions, heavy leptons and $W, Z, H$? To clarify the data I ...
1
vote
1answer
75 views

Where is the data for work functions of simple metals?

I am looking for actual, published data on the work function of metals (Al, Au, Cu) that I can analyze by myself using Matlab. Google Scholar only offers published articles on the utilization of the ...
0
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1answer
51 views

Determining Threshold Voltage and Plateau from experimental data

I’ve been trying to figure out how to interpret the following data from the Geiger muller tube There are only seven data points. Where does the plateau begin? Has the data collection begun after the ...
55
votes
3answers
9k views

Is there a physical limit to data transfer rate?

Is there a physical limit to data transfer rate (e.g. for USB $3.0$, this rate can be a few Gbit per second)? I am wondering if there is a physical law giving a fundamental limit to data transfer rate,...
1
vote
1answer
33 views

Hulse-Taylor binary data gap in the nineties

I was wondering what is the reason there are no data points in the famous Hulse-Taylor plot of the period decay in the 1990s. Does anyone know why no one collected data during this period?
0
votes
1answer
24 views

Comprehensive source of skin effect depths vs frequncy in different metals or method to calculate?

Is there a comprehensive source of skin effect depths vs frequency for different metals? I'm looking for Iridium and Osmium specifically, but it would be good to have them all if possible. Ideally ...
0
votes
1answer
50 views

Where can I find raw data of neutron energy spectra?

I am looking for raw data of the (normalized) neutron flux of a $^{241}$Am-$^9$Be-source, or in other words, the data of this graph. Where can I find that? Apparently, there has to be an ISO standard....
1
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0answers
78 views

Is there a database for experimental evidence of different physical theories? If not, how to find up-to-date information? [duplicate]

at present, I write a thesis about how one theory of physics can be "embedded" into another one in the sense that all phenomena that hold in one theory emerge as special cases or approximations in ...
9
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4answers
316 views

Will quantum computing provide any advantage for storing large amounts of data?

Essentially, does superposition or entanglement provide any advantage for data storage as opposed to classical memory.
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5answers
3k views

How do scientists determine when to disregard a model that has a higher correlation to data than another model?

For any set of data points, you can comprise a 100% correlated and fitted curve using a sum of sloped lines all multiplied by their respective Heaviside step functions to form a zig-zag shaped curve. ...
3
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0answers
64 views

Did early hard drives lose data from it getting read too many times?

According to wikipedia, early HDD drives used to use an electromagnet to 'write' data on a small region by magnetizing it. I also read in that same article, however, that they also 'read' the data ...
3
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2answers
36 views

Data supporting abundance of H and He in universe

I am a science educator, writing a lesson sequence for students on understanding evidence that supports the big bang theory. I am trying to figure out whether there is accessible galaxy spectral DATA,...
1
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1answer
21 views

Where can I find the light damage threshold of a specific material (in this case, latex)?

I am a part of the University of Maryland Balloon Payload Program, which sends student-built payloads via helium weather balloon to the upper atmosphere. I am interested in developing an Early Flight ...
2
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2answers
442 views

Why do we plot distributions (histograms, etc) per logarithmic interval (i.e. per “dec”/“dex”)?

I was trying to explain why we plot distributions (for example the Luminosity distribution function attached) per logarithmic interval (another example would be spectral energy distributions per ...
1
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1answer
753 views

Total positive energy in the (observable) universe

As long as I tried to find out what the total positive amount of energy is in the universe, the only answer I got was 'the total energy in the universe zero', which I do appreciate, but that's not ...
3
votes
2answers
181 views

Are there experiments that deal with the headlight effect?

If I am not mistaken, the Ives-Stilwell experiment measures the frequency of emitted light to test the relativistic doppler formula. Is there anything like this for light intensity? Have we measured ...
1
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0answers
75 views

Data Transfer & Physics

I am doing a large end of high school project on some physics, which has to involve an experiment. In lieu of this, I bought myself a micro oscilloscope - RSO138 - which I would use to listen to data ...
0
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0answers
115 views

Verify standard deviation of position samples with reference

Given are the reference data samples of a moving object and data samples that are obtained from a radar sensor with corresponding standard deviations for each sample point $\sigma_t$. I would like to ...
2
votes
2answers
8k views

Relation between data rate, frequency(RF) and distance

As I know.the higher frequency can carry higher information.Lets consider we have sub1-GHZ (data transmition) wireless MCU 868 MHz.According to specification it can transmit 100kbps at distance of ...
0
votes
1answer
34 views

How do low voltage differential signals transmit bits

For example: There is Din+ connected to pin a1 and Din- to pin a2. Suppose I am sending "0101". How does it get sent? If there was only Din connected to Pin a1, which has a voltage supply to the bank ...
2
votes
1answer
296 views

Simple Error Analysis for ratio of Flow Rates in a tube

I am trying to do simple error analysis but I am running into trouble. My experiment was to determine the ratio of flow rates of different pressure amounts on the tubes. My errors are: $5\%$ error ...
0
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1answer
64 views

Is there a central site for accessing physics data for research? [duplicate]

What I'm looking for is a central website where you can search for, say, "quantum entanglement experimental results" and it would give you links to various other sites. Similarly if you wanted "radio ...
1
vote
1answer
62 views

Exceed Information limit with a Bigger Codebook? [closed]

I was reading about how there is an upper limit to how fast information can be transmitted over a given channel - the Shannon–Hartley theorem. I was wondering how this theorem works with codebooks. ...
1
vote
1answer
153 views

Propagation of Electric Signal from Physics Perspective? [closed]

We know that in terms of copper or metal conductors, when one part is given heat the other part also gets hot. This is some kind of transmission of electrons. Signal transmission in terms of data ...
1
vote
1answer
77 views

Standard convention for $x$ error bars

What is the standard convention regarding the error bars of the independent quantity in a graph? In what situations should I show the $x$ error bars? In case both $x$ and $y$ uncertainties are ...
0
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0answers
210 views

Cygnus X-1, HDE 226868 radial velocity and mass function

Where could I find the data of the Radial Velocity for the visible companion (an O class star) for the binary system of Cygnus X-1? Also for this system, we have the mass function $$ f(M)=\dfrac{PK_C^...
1
vote
1answer
1k views

How to convert intensity arbitray units to percentage in a XRD data?

In powder x ray diffraction result contains mainly two values 2theta and intensity where 2theta is in degree's and intensity is in arbitrary unit ...
1
vote
1answer
301 views

Sloan Digital Sky Survey (SDSS) spec file headers

I downloaded spectra from Sloan Digital Sky Survey (SDSS), which has the following column headers flux, loglam, ivar, and_mask, or_mask, wdisp, sky and model (...
4
votes
2answers
204 views

Combining two data points with different uncertainties

I have two separate algorithms (call them "A1" and "A2") which reconstruct the $(x, y)$-position of an event in a particle detector. I can test both of these algorithms on simulated events from a very ...
16
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2answers
2k views

How to deal with zero uncertainties?

Suppose you measure quantity $x$ with an uncertainty ${\rm d}x$. Quantity $f$ is related to $x$ by $f=x^2$ . By error propagation the uncertainty on $f$ would be ${\rm d}f=2x{\rm d}x$. If a certain ...
1
vote
1answer
112 views

Gamma Ray Burst data

I wanted to know if there was some database for gamma ray burst (GRB) data. I would like to get the luminosity and duration of recorded GRBs. So far, I have come across this website, but since I do ...
3
votes
1answer
101 views

How would you read memristor data?

According to many experts; memristors have the potential to change and drastically improve data storage and processing power of computers. But there is one small thing that doesn't fully make sense to ...
1
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0answers
182 views

Current length of the solar day?

As can be seen in this diagram, the length of the solar day has varied Question considerably the last century. But the diagram is incomplete and doesn't show the very last years. Can anyone tell me ...
1
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0answers
28 views

Data acquisition from Pins ( 5Volt) [closed]

I'm trying to creat a data acquisition system using: computer Geosig ve-53 KPci3101 from the seismic sensor's manual we can see that every pin's output is a 5 volt (or 10?), my question is, how can ...
20
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3answers
6k views

Can gravitational wave be used for data transmission?

Imagine an advanced civilization which can manipulate gravity like we manipulate electromagnetic radiation. Could they already be using gravitational waves for data transmission across different ...
2
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0answers
114 views

Data storage in flash drives

In a pen drive, I have read that data is stored by trapping the electrical signals sent from the computer in silicon dioxide chambers. But what I dont understand is that how does the electrical signal ...
4
votes
3answers
112 views

Raw data acquirable from amateur astrophotography

What raw data can I possibly acquire from an 8" Classical Dobsonian Telescope, and a DSLR? Could anything eye-opening to amateur astronomers be computed or calculated first-hand with such equipment? I'...
8
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4answers
8k views

Why we don't use gamma rays, x-rays or ultraviolet to transmit data?

The greater the frequency range of a transmission medium, the greater the number of bits per second it can transmit. In other words, the bigger the bandwidth in hertz available, the bigger the ...
0
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5answers
514 views

Physical properties of niobium pentoxide ($\mathrm{Nb}_2\mathrm{O}_5$) for thermal simulation

I am looking all day long for heat capacity, thermal conduction, and expansion coefficient of niobium-pentoxide. I want to conduct a thermal (heat flow) analysis on this and need it as input data. Can ...