747 Ils Frequency

[Damaris]

Frequencyis an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light.

The SI unit of frequency is the hertz (Hz),[4] named after the German physicist Heinrich Hertz by the International Electrotechnical Commission in 1930. It was adopted by the CGPM (Confrence gnrale des poids et mesures) in 1960, officially replacing the previous name, cycle per second (cps). The SI unit for the period, as for all measurements of time, is the second.[5] A traditional unit of frequency used with rotating mechanical devices, where it is termed rotational frequency, is revolution per minute, abbreviated r/min or rpm.[6] 60 rpm is equivalent to one hertz.[7]

As a matter of convenience, longer and slower waves, such as ocean surface waves, are more typically described by wave period rather than frequency.[8] Short and fast waves, like audio and radio, are usually described by their frequency. Some commonly used conversions are listed below:

An old method of measuring the frequency of rotating or vibrating objects is to use a stroboscope. This is an intense repetitively flashing light (strobe light) whose frequency can be adjusted with a calibrated timing circuit. The strobe light is pointed at the rotating object and the frequency adjusted up and down. When the frequency of the strobe equals the frequency of the rotating or vibrating object, the object completes one cycle of oscillation and returns to its original position between the flashes of light, so when illuminated by the strobe the object appears stationary. Then the frequency can be read from the calibrated readout on the stroboscope. A downside of this method is that an object rotating at an integer multiple of the strobing frequency will also appear stationary.

Higher frequencies are usually measured with a frequency counter. This is an electronic instrument which measures the frequency of an applied repetitive electronic signal and displays the result in hertz on a digital display. It uses digital logic to count the number of cycles during a time interval established by a precision quartz time base. Cyclic processes that are not electrical, such as the rotation rate of a shaft, mechanical vibrations, or sound waves, can be converted to a repetitive electronic signal by transducers and the signal applied to a frequency counter. As of 2018, frequency counters can cover the range up to about 100 GHz. This represents the limit of direct counting methods; frequencies above this must be measured by indirect methods.

Above the range of frequency counters, frequencies of electromagnetic signals are often measured indirectly utilizing heterodyning (frequency conversion). A reference signal of a known frequency near the unknown frequency is mixed with the unknown frequency in a nonlinear mixing device such as a diode. This creates a heterodyne or "beat" signal at the difference between the two frequencies. If the two signals are close together in frequency the heterodyne is low enough to be measured by a frequency counter. This process only measures the difference between the unknown frequency and the reference frequency. To convert higher frequencies, several stages of heterodyning can be used. Current research is extending this method to infrared and light frequencies (optical heterodyne detection).

Sound propagates as mechanical vibration waves of pressure and displacement, in air or other substances.[10] In general, frequency components of a sound determine its "color", its timbre. When speaking about the frequency (in singular) of a sound, it means the property that most determines its pitch.[11]

The frequencies an ear can hear are limited to a specific range of frequencies. The audible frequency range for humans is typically given as being between about 20 Hz and 20,000 Hz (20 kHz), though the high frequency limit usually reduces with age. Other species have different hearing ranges. For example, some dog breeds can perceive vibrations up to 60,000 Hz.[12]

In many media, such as air, the speed of sound is approximately independent of frequency, so the wavelength of the sound waves (distance between repetitions) is approximately inversely proportional to frequency.

In physics, the term frequency refers to the number of waves that pass a fixed point in unit time. It also describes the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.

The symbols most often used for frequency are f and the Greek letters nu (ν) and omega (ω). Nu is used more often when specifying electromagnetic waves, such as light, X-rays, and gamma rays. Omega is usually used to describe the angular frequency.

Frequency is usually expressed in the hertz unit, abbreviated Hz. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz. In spectroscopy, another unit of frequency that is sometimes used is the wavenumber, the number of waves in a unit of distance.

I had no idea what the correct parameters were, so I just chose my features and then run the simulation, set with the current time. Now I have the map with two colors, 0 and 1. Does this mean now that all areas with 1 are in the shadow and the ones with 0 are without (at least that's what makes the most sence to me)?

What I originally wanted to do is creating a layer that shows me the shadows of my buildings during a whole (summer) day. But everytime I try to run the task with setting a start and an end time, I only get a layer with only one color (and no shadows?)...

The output of this tool is a raster where the value of each cell corresponds to the number of time where the cell isn't exposed with a direct sight line to the sun (it corresponds in your case to being in the shade)

But the more objects, the longer the calculation time....so it will be a problem for you apparently.

I checked the tool and unfortunately, it's not very well optimized. Sun shadows frequency can't use GPU and it can only use mono-thread CPU calculation power.

Some customers have alternative billing situations for their products that do not fit within our current billing frequency options below. It would be nice if they had the option to create other intervals. One customer needs a five year option for example and has to find a workaround.

Just a note here - 4 and 5 year billing frequencies are now live.

For customers looking for shorter hourly/weekly/bi-weekly and 18 month options, note that this is not currently on our roadmap for delivery but it is being discussed. Frequencies non-divisible evenly by 12 have big implications on deal calculations, totals, future start dates, and require a significant re-thinking across the board. We'll continue to discuss this as a future option, but I don't expect this through the first half of 2024.

Hi, community. I just wanted to share an update on this request. This idea is still in review, but we do hope to deliver on the longer time ranges in the next couple of quarters. For the shorter cycles, we have begun to investigate the scope and implications across our various commerce systems but do not yet have a firm plan for moving forward at this time. Thank you, Victoria Gumaer.

Hey folks - Ethan here, product manager for the Product Library. Apologies for the missed quarter of updates. I want to let you know that this feature is not on our roadmap for this quarter (Q3, 2022). We absolutely want to expand the flexibility of billing and contract frequencies within the HubSpot Product object, but we're working on several other features this quarter and we needed to make some hard decisions about what to prioritize.

I won't be doing this for every idea, but most ideas above 100 kudos will get this treatment. Previously, I had been trying to do it for ideas greater than 25 upvotes, but unfortunately the volume is too high to be practical.

Hey folks - Ethan here, PM for the Products and Line Items team. I just wanted to let you know that this feature is not on our roadmap for this quarter, again. We absolutely want to expand the flexibility of billing and contract frequencies within the HubSpot Product object, and it's likely we will work on this project this year, but we're working on several other features (e.g. adding support for installement plans/payment schedules, support for discount codes, and making the line item editor more standard) this quarter and we needed to make some hard decisions about what to prioritize.

Hey folks - my name is Ethan and I'm the product manager for the Products and Line Items team. I just wanted to let you know that this feature is not on our roadmap for this quarter. We absolutely want to expand the flexibility of billing and contract frequencies within the HubSpot Product object, and it's likely we will work on this project this year, but we're working on several other features (e.g. allowing you to add Line Items to Deals via Workflows, expanding the number of supported decimals in Product/Line Item properties) this quarter and we needed to make some hard decisions about what to prioritize.

Just to be clear, this is not an option per product but of the summary when products are added to a deal. In the summary outline on the right hand side - there is the billing frequency of the deal itself, which is used to calculate the deal value. In this dropdown would be nice to be able to have a longer time period, so that we can accurately describe the term of the deal.

With the impact of COVID - we are seeing an uptick in customers wanting to move to a CAPEX vs. OPEX model, so the ability to adjust billing frequency (in my specific need today it's five years, but ideally this field can be filled in with term flexibility) is really critical.

We also have issues with the current possibilities of billing frequencies. Our demand is not for shorter periods, but for longer periods. We are in Enterprise SaaS and we do have customers on plans going for 4 or even 5 years. We -desperately- are missing those options today, which makes it cumbersome to handle those customers correctly with the current possibilities for billing frequency.

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