Amplitudetrabajos

Incorporar un sistema de analitica con Amplitude o Mixpanel.

Definición / Monitorización / Optimización de KPIs. <br /><br />Análisis de datos / tráfico / insights / cohortes / bbdd / campañas de marketing con el objetivo de optimizar la experiencia del usuario y por tanto los objetivos de negocio. <br /><br />Gestión de la implementación de eventos en Amplitude / Google Analytics acordes con los objetivos definidos. <br /><br />Desarrollo de Dashboards. <br /><br />Desarrollo y seguimiento de Test A/B. <br /><br />Desarrollo de LifeCycles. <br /><br />Participación en el desarrollo y optimización del producto aportando nuevas ideas.  Comunicación continua con los distintos equipos para prov...

I'm seeking a skilled electronics engineer for the development of a basic single-layer PCB prototype. Here are the essentials: - This circuit creates a pulse amplitude modulated signal which is amplified at high power. The signal is genrated within the circuit so no user input is required. - This project has been worked on before and an added varible resistor and mosfet will be needed as well as the most important part which is power management which can be done with component selection or circuit alterations. - The purpose is a prototype development, which means you'll be instrumental in bringing my concept to life and preparing it for eventual manufacturing. - The PCB design will incorporate analog components, so expertise in working with these components is a must...

...for 4 emotion i.e sad, happy,anger and fear. - Dataset already created of 150 sample in .wav files at 16khz, 16bit mono audio with emotion annotated of file name 4th letter. (Cannot share Dataset, as it is under process for research paper) - Feature extraction: (make sperate folder after feature extracted) 1. Time-domain features - *short-term energy of signal, zero crossing rate, maximum amplitude, minimum energy, entropy of energy* 2. Frequency-domain features- * MFCC - [12 (form 26 mel freq), 13 delta,13 delta acceleration ], spectral centroid, spectral rolloff, spectral entropy and chroma coefficients* - Do K-means clustering, make confusion matrix and do MLP perceptron. choose epochs as per needed - Make a user interface model where input audio of unknown samp...

matlab code for fnirs data i need Wavelet Amplitude Values(WAV）

Hey everyone, I need a small python script that I can run in visual studio code. The script should do the following: - It should cut out a sinusoidal form at the edges of an image. - It must take into account the transparency in an image. This...transparent up to half, the sine curve should only start in the visible area. - The script should take the example image in the same folder as the script, modify it, save it under a new name and open it. - At the end of the script, I want to have a function in which I enter the values "top", "right", "bottom" or "left" and accordingly the respective image edge is edited. - In addition, the amplitude and the smoothness must be able to be adjusted in the function. I will send an example image wi...

I require an experienced MATLAB developer to calculate the Error Vector Magnitude for a 16-quadrature Amplitude Modulation scheme. The details for this project are as follows: **Core Objectives:** - Develop MATLAB code for EVM calculation. - Work with simulated signal data. - Generate basic plots for result visualization. **Ideal Candidate:** - Proficient in MATLAB and signal processing. - Familiar with QAM schemes, especially 16-QAM. - Experienced with EVM concepts. - Able to produce clear, accurate plots. **Scope of Work:** - Analyze the given simulated signal data. - Calculate the EVM for the 16-QAM scheme. - Create basic plots to visualize EVM results. I'm looking for someone who can deliver precise and reliable calculations with a clear graphical presentation of the da...

To further investigate and predict autism spectrum disorder (ASD) and typical development (TD), I'm aiming to develop an advanced multimodal deep learning model, such as Transformer. This model will primarily use EEG data, so any pote...will primarily use EEG data, so any potential candidates for this project should have the qualifications, attached in the documents. Although I'm not sure which specific EEG signals are significant for ASD detection, I'm looking for someone with a comprehensive understanding of EEG data who can guide the project. This involves determining what signals might be important, such as frequency bands, amplitude, or event-related potentials (ERPs), amidst the many facets of EEG data. Help me revolutionize early ASD and TD detection with your ...

...electronics. I need an Arduino size or at least a handheld size so it can be used 24 hours a day. It will consist of a controller for the intensity amplitude and frequency, pulse width, 2 channels, with a rectangular symmetrical wave pattern. The specs are as follows. Again I just need someone to build this device or tell me the parts to buy to build the device myself. You can either build yourself or submit the schematics along with exact parts list and ill build it myself. Here are the parameters. Second build is rectangular symmetrical waveform with (125ms ) between phases with the waveform of the system pulse being biphasic Pulse width=250us Amplitude 0 to 5.0ma 120x60x25 mm size 11grams This includes an intensity controller handheld 3 triple A batteries in series max...

...competitor analysis to stay ahead of market trends. Technical Proficiencies: - Familiarity with our tech stack: Slack, Canva, Google Workspace, ClickUp, Chat GPT, HubSpot, Sendinblue, WordPress, and Shopify. - Experience or knowledge of technologies (is a plus but not necessary) we work with for clients: WordPress, Shopify, Python, Salesforce, Braze, Moengage, Clevertap, HubSpot, Webengage, Singular, Amplitude, Mixpanel, Google Analytics, Adjust, Ultrarev, Brevo, Exponea, Bluecore, Omnisend, Insider, Emarsys, , Attentive, Salesloft, Outreach, Klaviyo, Tealium, Segment, Hightouch, mParticle, and others. Requirements: - Proven experience in digital marketing, particularly in social media management, SEO, and paid advertising. - Strong analytical skills and expertise in generating...

...freelancer with beginner to intermediate level programming experience to code and build an Arduino-based system. The system should sync 12v water pumps to music, with the desired outcome being frequency, beat and amplitude matching. The goal is to take music in through a 3.5mm connection, split the frequencies up into at least 7 groups using something like an MSGEQ7 in real-time, then using this information trigger the pumps based on both the frequency and amplitude, creating a water-based music visualizer so that the strength of water flow through the pumps matches the amplitude of the given frequency. Instructions should be included on how to modify the code so that we can adjust a minimum threshold for turning a pump to an on state, and how strong the water flow...

...Scroll events - Hover events - Page opens These events should be triggered based on the following actions: - Element clicks - Page scrolls - Element hovers - Upon page load The main functionality of the events is to fire a JS tracking event to an Analytics platform such as Mixpanel and Amplitude. The ideal candidate for this project will be proficient in JavaScript programming, with a solid understanding of website analytics and experience in the integration of analytics platforms like Mixpanel and Amplitude. Familiarity with implementing dynamic event tracking is a definite plus. In your proposal, please showcase previous JavaScript projects where you successfully integrated event tracking. I look forward to seeing your bids. Here's a high level PRD: Title: ...

...from Design: You will be responsible for developing the app based on the provided UI/UX designs. The application should be responsive and optimized for a variety of devices and screen sizes. Database Design and Implementation: Develop a robust database architecture. You will also implement Firebase as the backend service, ensuring efficient data handling and security. Integration of Amplitude: Incorporate Amplitude for advanced analytics and user tracking. Experience in integrating third-party analytics tools is essential. Manual Testing: Conduct thorough manual testing of the application to identify and fix bugs, ensuring a smooth and reliable user experience. App Store and Google Play Publishing: Handle the entire process of publishing the app on both the Apple App S...

...from Design: You will be responsible for developing the app based on the provided UI/UX designs. The application should be responsive and optimized for a variety of devices and screen sizes. Database Design and Implementation: Develop a robust database architecture. You will also implement Firebase as the backend service, ensuring efficient data handling and security. Integration of Amplitude: Incorporate Amplitude for advanced analytics and user tracking. Experience in integrating third-party analytics tools is essential. Manual Testing: Conduct thorough manual testing of the application to identify and fix bugs, ensuring a smooth and reliable user experience. App Store and Google Play Publishing: Handle the entire process of publishing the app on both the Apple App S...

I will complete Step 1 to Step 3 of the file provided. Step 1: programming a device (ESP32) as a transmitter and another device (ESP32) as a receiver. Step 2: the transmitter continuously transmits beacon frames over different sub-carriers ...file provided. Step 1: programming a device (ESP32) as a transmitter and another device (ESP32) as a receiver. Step 2: the transmitter continuously transmits beacon frames over different sub-carriers which are modulated through any modulation technique with a specified frequency, amplitude, and phase and the receiver receives the signal and be able to extract the received frequency, phase, and amplitude of the received signal. Step 3: live visualisation (plots) of the changes in frequency, phase, and amplitude over different...

So I have been working on this project with EEG signals where I give stimulus to a mouse in the form of motor and light generated signals control via arduino. I record EEG data with and without this external stimulus.I have the code to analyse the EEG data in the absence of this stimuli but I need help in synchronization of the stimuli to the EEG signal derived from a mouse. I want to meas...stimuli but I need help in synchronization of the stimuli to the EEG signal derived from a mouse. I want to measure the phase delay correspending to the stimuli The EEG data that I record is through a open source software Open Ephys The data of stimuli comes through one channel and the EEG data comes through another 5 channels So basically, I need to segregate one wave signal on the base of ampl...

ESP32-CSI-Collection-and-Display I am looking for a developer to help me develop a new ESP32-CSI module. The desired outcome of the project is to create an open-source platform that the user be able to program the transmitters and receivers in order to be able to detect channel state information (CSI) including: phase, frequency, amplitude and display and record this data. So when a user connects an ESP32, choose the mode of operation (transmitter/receiver) and the corresponding code is loaded on the controller. All of the devices then should be connected to the same WiFi that host (platform) is connected to so that they can communicate with the platform. The transmitters should have the option to send beacon frame or data frames and the receiver based on the signal of these frames...

ESP32-CSI-Collection-and-Display I am looking for a developer to help me develop a new ESP32-CSI module. The desired outcome of the project is to create an open-source platform that the user be able to program the transmitters and receivers in order to be able to detect channel state information (CSI) including: phase, frequency, amplitude and display and record this data. So when a user connects an ESP32, choose the mode of operation (transmitter/receiver) and the corresponding code is loaded on the controller. All of the devices then should be connected to the same WiFi that host (platform) is connected to so that they can communicate with the platform. The transmitters should have the option to send beacon frame or data frames and the receiver based on the signal of these frame...

A flyback boost circuit that needs to be fixed as I cannot get the simulation to work. Should be constant current. Amplitude - between .2 - 20mA Channel gros on off at 2kHz. Enable is on. Open drain has to be closed by the uP. V_SYS is at 5.1V. HV at 140V I2C sets the ePot resistance Current path from the ring finger to the thumb. Driven by an ESP32 For chronic pain. End waveform

Resting EEG of control subjects was recorded in a quiet room wit...the extended 10-20 system from the EEG data (e.g. Cz, F3, F4) 4. apply Hanning windowing to the filtered signal at the selected position 5. use an elliptic bandpass filter [1.5-45] GHz (see attachment) 6. call the MATLAB elliptic filter function to extract theta, alpha, beta, beta-low, beta-high and gamma bands 7. plot the individual frequency bands 8. create an FFT and calculate and plot the amplitude, absolute power, relative power and power spectral density (PSD) of theta, alpha, beta-low, beta-high, gamma, alpha/beta, alpha/theta, theta/beta, alpha/(beta+gamma), (theta/beta+gamma). *Not all data have this temporal structure, so it would be desirable for the time to be entered in some way, either automatically or...

...digital PID temperature controller that we have it has a type-K thermocouple input and it needs to be connected to the PWM outputs in some way for good temperature control. Lastly, the STM32H735G-DK evaluation kit needs to have several live data screens of GUI programming included in the programming to assist the user with getting to the functions and for monitoring the PWM squarewave signals and amplitude in real-time with several graphics pages on the touchscreen display. Desired Skills and Experience: - Proficiency in programming microcontrollers, specifically the STM32H735G-DK Discovery kit (Prototype testing board) - Strong knowledge and experience with PWM signal generation in the frequency range of 1kHz-10kHz - Expertise in implementing a PID controller for the feedback ...

...streaming, but with some tracks only accessible to subscribers. I am open to the freelancer's recommendation for the technology stack, but I would prefer to use Strapi and React as mentioned in the project title. In addition to the above, I do have comfort with REST+Postgres and would prefer those. I am open to hosting on GCP or AWS. Other third parties and technologies I'd like to leverage is Amplitude for analytics and a CDN to host tho audio files. In terms of specific javascript packages, I am leaning towards along with D3.js to add additional functionality. The website will require integration with a third-party service for payment processing. Ideal skills and experience for this project include: - Proficiency in Strapi and React - Experience with audio stre...

I took a long time to connect the equivalent circuit of the piezo material (Quartz) to its electrodes (attached on both sides of the quartz), gave it sine voltage, and did a harmonic analysis to see the amplitude of piezo oscillation in the specific range of frequency. I added the CAD data directly to the workbench and added the APDL commands (attached) to the modal analysis (added before the harmonic analysis). Based on the errors I receive " Element 18590 does not have all of its required nodes defined. The E command is aborted" I am guessing that the problem is with nodes and elements that I introduced. It would be really appreciated if you can help me with this issue.

This is an existing website that is build on Wordpress with WooCommerce/Stripe and Elementor. We are looking for a Wordpress developer that can help us with SEO (technical), PageSpeed Performance, new page sections, structural changes and tracking setups (HotJar, Amplitude for A/B tests, HubSpot tracking).

...brain slices. The data includes paired synaptic responses and the effects of various drug cocktails on these responses. Responsibilities: Develop a MATLAB function to import and process .wcp data files using import_wcp.m function. Write code to analyze the data and extract key parameters, such as the average peak amplitude of the first fEPSP under different drug conditions. Implement statistical analyses to determine the effects of the various drug treatments on the peak amplitude of the first response. Ensure the code is well-documented with clear comments and a brief 'help' description explaining the function's usage, inputs, and outputs. Collaborate with the research team to understand the experimental details and incorporate them into the data ana...

Design a circuit to measure the voltage amplitude of a 0 to 480 VAC circuit with a 3.3V microcontroller analog input. The off voltage will be 0 VAC, the on voltage will be 120, 208, 240, or 480 VAC. Assume a maximum input of 1.3x or 624 VAC. All power is at a frequency of 60 Hz. This circuit should not adversely influence the VAC circuit being measured, and it should provide a 0 to 3.3 VDC linear output that can be measured by a microcontroller analog input.

...requirements: 1. Recording equipment: Record with high-fidelity equipment, and it must be recorded in a recording studio or a quiet bedroom. The noise floor should not exceed 40db, and the vocal amplitude should be between 5000-15000smpl. it is not a local speaker, no pay. pronunciation staff, no pay. 1. The pronunciation of the words is consistent, and the words are pronounced clearly. Do not swallow too few words, too many words, or wrong pronunciation. 2. The background noise shall not be greater than 40db, and the audio shall not have interference or echo; 3. The vocal amplitude is 5000-15000smpl; 4. The pause between words should not exceed 0.5 seconds, the silent period before and after the audio should be kept at 0.5 seconds, not too long or too short, the silent ...

...requirements: 1. Recording equipment: Record with high-fidelity equipment, and it must be recorded in a recording studio or a quiet bedroom. The noise floor should not exceed 40db, and the vocal amplitude should be between 5000-15000smpl. it is not a local speaker, no pay. pronunciation staff, no pay. 1. The pronunciation of the words is consistent, and the words are pronounced clearly. Do not swallow too few words, too many words, or wrong pronunciation. 2. The background noise shall not be greater than 40db, and the audio shall not have interference or echo; 3. The vocal amplitude is 5000-15000smpl; 4. The pause between words should not exceed 0.5 seconds, the silent period before and after the audio should be kept at 0.5 seconds, not too long or too short, the silent ...

I'm looking for someone experienced with developing an ultrasound device to help me with a project. The intended use of the device is for medical diagnostics, and I need it to be a portable device with a target budget of under $500.. Thank you. PREFER SOME BASED IN CHENNAI , INDIA LIPUS device -1.5 MHz with pulse repetition rate of 1.0 kHz, the pulse d...e., a pulse duration of 200 us and a null duration for 800 LLs), and the average intensity of the pulsed ultrasound is approximately 30 mW/cm. These characteristics may be exhibited, for example, using a piezoelectric transducer with a resistance of approximately 5ohm at 1.5 MHz frequency. Piezoelectric transducers of different characteristics can be accommodated after adjusting the signal amplitude to ensure desired ultra...

"Recording with high-fidelity equipment must be done in a recording studio or a quiet bedroom, the noise floor should not exceed 40db, and the vocal amplitude should be between 5000-15000smpl. Require: 1) Use the easy voice record app, according to iOS and Android devices, set the unified requirements: 16bit, 16000hz, wav format. 2) The environment must be quiet, otherwise it will not pass and will not be settled. 3) According to the order of the text, record sentence by sentence. Do not read casually. 4) The file name needs to be named uniformly. Such as German: , NO346_M001_fast_001.wav. , , Persian: , NO345_M001_fast_001.wav. NO345_F001_normal_006

"Recording with high-fidelity equipment must be done in a recording studio or a quiet bedroom, the noise floor should not exceed 40db, and the vocal amplitude should be between 5000-15000smpl. Require: 1) Use the easy voice record app, according to iOS and Android devices, set the unified requirements: 16bit, 16000hz, wav format. 2) The environment must be quiet, otherwise it will not pass and will not be settled. 3) According to the order of the text, record sentence by sentence. Do not read casually. 4) The file name needs to be named uniformly. Such as German: , NO346_M001_fast_001.wav. , , Persian: , NO345_M001_fast_001.wav. NO345_F001_normal_006

I am looking to source a variable amplitude & frequency-sine wave voltage source. The required voltage range is from 0-200, and the required frequency range is from 1-500Hz. This voltage source must have adjustable amplitude and frequency. If you have experience providing products with similar specifications, I would love to hear from you. Thank you!

I require a software writer who is very competent in “C”; works quickly and keeps in regular communication. I have a circuit board which has two processors; STM32F429 and a STM32L152. There are the usual control switches and a LCD screen. Basically the system generates a sinewave which is fed through a variable resistance circuit. The drop in amplitude of the sinewave is measured and recorded in a file. I have a bootstrap program that is written and stable and also several application programs. I need several additional programs written and some of the existing programs modified. There will be ongoing maintenance work and also an AI – machine learning – project if the freelancer is capable. I have the existing source code and notes plus correspondence over t...

Assessment about filters Table of Contents:  Introduction  Definition of Signal Modulation  Importance and Utilization of Signal Modulation  Types of Signal Modulation 1. Amplitude Modulation 2. Frequency Modulation 3. Phase Modulation  Implementation of Signal Modulation 1. FM Implementation 2. AM Implementation 3. PM Implementation  Applications of Signal Modulation 1. Applications of FM 2. Applications of AM 3. Applications of PM  Advances of Signal Modulation  MATLAB – Fourier Analysis 1. Square Wave 2. Triangular Wave  Conclusion  References

Documentar el paso a paso para implementar amplitude en un app desarrollador en React Native

Наша компания в поиске фрилансера, который сможет настроить для нас аналитику в Click up через программу Amplitude: , чтобы была видна: 1. Воронка по каждому борду pre-selection-hr interview-hm interview-offer-reject (с причиной мы отказали или нам отказали) с возможностью посмотреть за весь период и за конкретный период; 2. Воронка по каждому рекрутёру pre-selection-hr interview-hm interview-offer-reject (с причиной мы отказали или нам отказали) с возможностью посмотреть за весь период и за конкретный период; 3. Сколько было добавлено новых карточек каждым рекрутером за выбранный промежуток времени по всем вакансиям и по конкретной вакансии; 4. Сколько кандидатов у каждого рекрутера было в определенном статусе за определенный промежуток времени (например в статусе job

...soil moisture retrieval. Consider appropriate channel propagation. It takes input variables from GUI such as type of soil, surface roughness, Soil Texture, Soil Density, Soil Temperature and vegetation cover. It then receives the signal and considers all the factors such as pathloss and soil properties loss and soil moisture loss. The reflected/received signal should is a representation of amplitude, phase and polarisation. Represent the reflected signal in terms of graphs and well. We do not have to create our own model or simulation. Just a matlab simulation code which takes into consideration all the soil factors that affect the signal for Soil Moisture retieval. Later process this signal using WCM. Additionally a GUI based input would be great to change the parameters. Gra...

I need some code using needed lybraries in order to have numerical data output like: amplitude-time for a chosen range of frequencies (data usually used for a spectrogram) My input may be a noisy envaironmental sound. The input file should be: WAV / MP3 / M4A (I'm requiring just one of these) That's it!

Build me a modulator which can convert 50 v of current into carrier waves( amplitude modulator) by modulator and also demodulate that waves. Also can you mild me a amplifier for the same amount of current

Looking for Data Engineers having atleast 3 years of experience in end to ETL/ELT, data transformation. Candidate should have the following skillsets in AWS, Azure and GCP. Candidates having experience in any of the cloud platforms can also apply Only candidates ...Pyspark, etc. Kafka/Kafka Connect, Spark, Flink or AWS Kinesis Apache Nifi Dataflow Kubernetes AWS Data Pipeline Snowflake GCP tools - GCS, GKE, BigQuery, Cloud SQL, Cloud Connector Golang Airflow Typescript Data: DBT, Fivetran, Redshift, PostgreSQL Infra: GitHub, Bazel, Docker Azure Data Factory Azure Databricks DAX MDX Terraform Visualization tools knowledge - Data Studio, Amplitude, Tableau Languages - Scala, Python, SQL Azure Synapse Mapping Data Flow Interested candidates can whatsapp on +1-81...

Need hydrodynamic analysis done for a hollow cylinder, cuboid on ansys aqwa to calculate response amplitude operators(RAO's). Need someone with good hands on experience with ansys aqwa.

I summed up 3 sine waves, then made a Fourier analysis but it doesn't work properly. Frequencies are 100 times smaller and amplitudes are 100 times highers. Additionally the biggest amplitude is linked to the smallest period. Finally, I have no idea how to find the phase. Thanks in advance your proposal.

Hey there, We have a porject that need Cantonese (Hongkong accent) vocie talent to record 90 short phrases . This task needs to be done with equipments that meets the requirements or in a professional studio. Audio parameter requirements: 48000hz, 16bit, mono, wav, and average amplitude of noise floor <-50dB Please feel free to contact me if you are interested.  Deadline: in 2 days Payment: 20USD Recording duration: 10-15m

FREELANCER AVEC EXPERIENCE All Assur, cabinet de courtage spécialisé dans le domaine de la santé et de la prévoyance opérant à partir de sa succursale basé à ...domicile. Donc, vous répondez parfaitement à nos critères et au profil que nous cherchons quelle que soit la ville dans laquelle vous vivez, vous travaillerez à distance. Nous vous offrons un contrat commercial en freelance et/ou Auto-entrepreneur et une rémunération très attractive non plafonnée. Avantages sociaux et autres Nous vous proposons un partenariat Win Win en toute transparence ! Amplitude horaire Vous travaillez selon votre rythme Type d'emploi : Temps plein, Temps partiel Question(s) de pr...

Need somebody who has done procesing of signals in realtime with some DSP chip that is fast enough, and within normal consumer budget. Or FPGA, or whatever hardware configurations, that are available. The attached spike has a duration of aprox 7 microseconds and an amplitude of 0.1 to 5.5 V. The input of the spike is around 200hz. We are trying to push it to 500hz or more. I need sampling on each channel at least 7msps. The proccesing each sample set and curve fitting, to get the peak perfect precision mathematical peak with a precision of 2 miliVolts. Then the data is interpreted in order to maintain the Curve, and not get saturated, (with that triangle-ish shape img6303) and a control signal is emitted to lower the excitation and come back to the curve normal shape. These...

I need someone that understands statistics to analyze data from soccer games. THis is focused in one specific market to find correlation between events. The person must be able to find things such as: Amplitude, Variance, Standard deviation, Frequency and on. The person have also to be able to create a dashboard taking data from a website to create future events prediction. Thanks.

1. Use LUT-DMA-PWM generate two sine-waves, (100, 300 Hz nominal), max harmonic distortion 0.5% 2. GUI to change Amplitude and frequency of the sine wave. need source code in C/C++ The sine-wave will be tested with dspic33ch512MP508 and DRV8833 to drive a speaker. harmonic distortion will be validated with FFT app.

4 flat piezos connected to a PCB, Qi rechargeable battery, bluetooth controlled by an app (app is for piezo vibration amplitude adjustment).

...togather to have common star point) curent source 0-15A, resolution of 1mA. Current source must be capable of producing pure sine wawe of 50 or 60Hz with additional higher harmonics ( up to 10th harmonic). MCU to be selected from STM32 range. Design should be possible to extend to 8 currents each fully independently programable. Values to control on each current source individualy are : Amplitude 1mA resolution Frequency 0.05Hz resolution, range 0-100Hz (plus higher harmonics of 50 and 60Hz) Phase angle 0-360 with 0.1 deegree steps ...

Hello - I am building a social network for online shopping using no-Bubble. I have segment and amplitude accounts but need help connecting and setting everything up properly ahead of our launch in Feb. Thanks, Sarah