Demo guide: The central limit theorem, visualized in ExcelGeorge Mount
Excel is not just a powerful tool for doing data, but for learning it: spreadsheets provide an unparalleled opportunity to look at the data, and watch it take shape before your eyes.
MailChimp data scientist John Foreman stated the advantage of learning data analysis with Excel like this: “You get to look at the data every step of the way, building confidence while learning the tricks of the trade.”
That’s why my demo guide on the central limit theorem, one of the most important statistical principles, is based not in a statistical programming language, but Excel.
What’s more, my example isn’t based on some sophisticated dataset or decontextualized random numbers, but the real-world example of a roulette wheel.
And, while the example of a roulette wheel may come from real life, the central limit theorm that it illustrates seems almost magical.
Demo guide: The central limit theorem, visualized in ExcelGeorge Mount
Excel is not just a powerful tool for doing data, but for learning it: spreadsheets provide an unparalleled opportunity to look at the data, and watch it take shape before your eyes.
MailChimp data scientist John Foreman stated the advantage of learning data analysis with Excel like this: “You get to look at the data every step of the way, building confidence while learning the tricks of the trade.”
That’s why my demo guide on the central limit theorem, one of the most important statistical principles, is based not in a statistical programming language, but Excel.
What’s more, my example isn’t based on some sophisticated dataset or decontextualized random numbers, but the real-world example of a roulette wheel.
And, while the example of a roulette wheel may come from real life, the central limit theorm that it illustrates seems almost magical.
Data Science - Part XII - Ridge Regression, LASSO, and Elastic NetsDerek Kane
This lecture provides an overview of some modern regression techniques including a discussion of the bias variance tradeoff for regression errors and the topic of shrinkage estimators. This leads into an overview of ridge regression, LASSO, and elastic nets. These topics will be discussed in detail and we will go through the calibration/diagnostics and then conclude with a practical example highlighting the techniques.
Discrete Mathematics is a collection of branches of mathematics that involves discrete elements using algebra and arithmetic. This is a tool being used to improve reasoning and problem-solving capabilities. It involves distinct values; i.e. between any two points, there are several number of points.
Simulation of Tracer Injection from a Well in a Nearly Radial FlowAmro Elfeki
This is a result of Simulation of Tracer Injection from a well in a nearly radial flow using finite difference and particle tracking Radom walks.
To observe the animation of the plume progress in time, one has to download the file.
Aquifer recharge from flash floods in the arid environment: A mass balance ap...Amro Elfeki
Estimation of the infiltration/natural recharge to groundwater from rainfall is an important issue in hydrology, particularly in arid regions. This paper proposes the application of The Natural Resources Conservation Service (NRCS) mass balance model to develop infiltration (F)–rainfall (P) relationship from flash flood events. Moreover, the NRCS method is compared with the rational and the Ф-index methods to investigate the discrepancies between these methods. The methods have been applied to five gauged basins and their 19 sub-basins (representative basins with detailed measurements) in the southwestern part of Saudi Arabia with 161 storms recorded in 4 years. The F–P relationships developed in this study based on NRCS method are: F = 39% P with R2 = 0.932 for the initial abstraction factor, λ = 0.2. However, F = 77% P with R2 = 0.986 for λ = 0.01. The model at λ = 0.01 is the best to fit the data, therefore, it is recommended to use the formula at λ = 0.01. The results show that the NRCS model is appropriate for the estimation of the F–P relationships in arid regions when compared with the rational and the Ф index methods. The latter overestimates the infiltration because they do not take λ into account. There is no significant difference between F–P relationships at different time scales. This helps the prediction of infiltration rates for aquifer recharge at ungauged basins from monthly and annual rainfall data with a single formula.
Basics of Contaminant Transport in Aquifers (Lecture)Amro Elfeki
This is a basic lecture on contaminant transport in aquifers. It covers various aspects. Types of transport in aquifers. Reactive and non-reactive, governing equations of solute transport. Method of solutions and simulations.
Data Science - Part XII - Ridge Regression, LASSO, and Elastic NetsDerek Kane
This lecture provides an overview of some modern regression techniques including a discussion of the bias variance tradeoff for regression errors and the topic of shrinkage estimators. This leads into an overview of ridge regression, LASSO, and elastic nets. These topics will be discussed in detail and we will go through the calibration/diagnostics and then conclude with a practical example highlighting the techniques.
Discrete Mathematics is a collection of branches of mathematics that involves discrete elements using algebra and arithmetic. This is a tool being used to improve reasoning and problem-solving capabilities. It involves distinct values; i.e. between any two points, there are several number of points.
Simulation of Tracer Injection from a Well in a Nearly Radial FlowAmro Elfeki
This is a result of Simulation of Tracer Injection from a well in a nearly radial flow using finite difference and particle tracking Radom walks.
To observe the animation of the plume progress in time, one has to download the file.
Aquifer recharge from flash floods in the arid environment: A mass balance ap...Amro Elfeki
Estimation of the infiltration/natural recharge to groundwater from rainfall is an important issue in hydrology, particularly in arid regions. This paper proposes the application of The Natural Resources Conservation Service (NRCS) mass balance model to develop infiltration (F)–rainfall (P) relationship from flash flood events. Moreover, the NRCS method is compared with the rational and the Ф-index methods to investigate the discrepancies between these methods. The methods have been applied to five gauged basins and their 19 sub-basins (representative basins with detailed measurements) in the southwestern part of Saudi Arabia with 161 storms recorded in 4 years. The F–P relationships developed in this study based on NRCS method are: F = 39% P with R2 = 0.932 for the initial abstraction factor, λ = 0.2. However, F = 77% P with R2 = 0.986 for λ = 0.01. The model at λ = 0.01 is the best to fit the data, therefore, it is recommended to use the formula at λ = 0.01. The results show that the NRCS model is appropriate for the estimation of the F–P relationships in arid regions when compared with the rational and the Ф index methods. The latter overestimates the infiltration because they do not take λ into account. There is no significant difference between F–P relationships at different time scales. This helps the prediction of infiltration rates for aquifer recharge at ungauged basins from monthly and annual rainfall data with a single formula.
Basics of Contaminant Transport in Aquifers (Lecture)Amro Elfeki
This is a basic lecture on contaminant transport in aquifers. It covers various aspects. Types of transport in aquifers. Reactive and non-reactive, governing equations of solute transport. Method of solutions and simulations.
This is a lecture on well hydraulics. The basics of flow towards the well in confined and unconfined aquifers. Well interactions. Method of images. Flow nets in case of multiple wells. Superposition theory for multiple wells.
This is a lecture on the hydraulics of gradually varied flow in open channels. It shows the profiles common in the open channels and some numerical examples using numerical integration.
Two Dimensional Flood Inundation Modelling In Urban Area Using WMS, HEC-RAS a...Amro Elfeki
This research presents a two-dimensional flood inundation modelling in urbanized areas when some features such as roads, buildings, and fences have great effect on flood propagation. Wadi Qows located in Jeddah City, Saudi Arabia was chosen as case study area because of the flood occurrence of 2009 causing lots of losses either economic or loss of life. The WMS and HEC-RAS program were used for a hydraulic simulation based on channel geometry built by incorporating urban features into DEM using GIS effectively. A resampling method of DEM 90 × 90 m become 10 × 10 m grid cell sizes was conducted to produce a higher resolution DEM suitable for urban flood inundation modelling. The results show that a higher resolution leads to increasing the average flood depth and decreasing the flood extent. Although the change of the grid cell sizes does not affect its elevation values, this approach is helpful to perform flood simulations in urban areas when high resolution DEM availability is limited. In addition, the integration of WMS, HEC-RAS and GIS are powerful tools for flood modelling in rural, mountainous and urban areas.
https://www.researchgate.net/publication/330004725_Two_Dimensional_Flood_Inundation_Modelling_in_Urban_Areas_Using_WMS_HEC-RAS_and_GIS_Case_Study_in_Jeddah_City_Saudi_Arabia_IEREK_Interdisciplinary_Series_for_Sustainable_Development
Representation of of Stochastic Processes in Stochastic Processes in Real and Spectral Domains Real and Spectral Domains and and Monte Monte-Carlo sampling
Development of Flash Flood Risk Assessment Matrix in Arid Environment: Case S...Amro Elfeki
Risk indices and risk matrix have been used among governmental agencies for assessing risks and ranking alternatives protection measures. The popularity of risk matrices can be associated with its characteristics to quick assessing risk and providing inexpensive solutions. The risk assessment is associated with flood protection as: economic, environmental, and life-safety. Economic risks are reasonably well dealt with by the well-known traditional cost-benefit analysis, insurance, and financial markets. Environmental risks are difficult to assess by traditional methods in flood project evaluation. Environmental consequences cannot be directly measured, while social risks represent the most challenge to quantify. It may be possible to estimate the number of fatalities, and cost of damaged infrastructures, while the social aspects cannot be measured. This paper is proposing a flood risk matrix technique for assessing risks in urban arid and extreme arid regions demonstrated through case-study application on the catchment of Taibah University (TU) and Islamic University (IU) in Medina, KSA. The study focused on assessing the geographical impacts of the flash flood inundated depths for different frequencies from 5 to 100 years return periods leading to identification of the flood channels, and its floodplains that may be vulnerable to different degrees of flood hazards.
Derivation of unit hydrograph of Al-Lith basin in the south west of saudi ar...Amro Elfeki
Mohammad Albishi, Jarbou Bahrawi and Amro Elfeki (2016). Derivation of the Unit Hydrograph of Allith Basin in the South West of Saudi Arabia. 7 International Conference on Water Resources and the Arid Environments (ICWRAE 7): 621-628 4-6 December 2016, Riyadh, Saudi Arabia.
Abstract:
Most studies on unit hydrograph theory is developed for temperate regions and to the best of the authors’ knowledge, there is no studies on this topic in arid regions because of the lack of runoff measurements. This paper presents the derivation of a unit hydrograph of a Allith basin and its S-curve in the south western part of Saudi Arabia to be used to predict flash flood more accurately in this region. The derivation is based on the method of stream flow data that has been collected from measured rainfall and runoff storms in the region. The study resulted in the unit hydrograph of 1 hr duration and the S-curve that is used to transfer the hydrograph to any other durations. This unit hydrograph can be used to predict flash floods in Allith basin and similar watersheds.
Empirical equations for flood analysis in arid zonesAmro Elfeki
Mohammad Albishi, Jarbou Bahrawi, and Amro Elfeki (2016). Empirical Equations for Flood Analysis in Arid Zones. Published in the book of abstracts at IWC 2016 International Water Conference 2016 on Water Resources in Arid Areas: the Way Forward.
Empirical equations for estimation of transmission lossesAmro Elfeki
Transmission losses is caused by infiltration into the streambed in ephemeral streams. The conventional methods for flood routing in wadis is impossible to achieve due to transmission losses. The Muskingum routing procedure in its basic form has two parameters, the channel time lag, Km, and the weighting parameter, x. However, both parameters do not consider transmission losses of floods in channels. O’Donnell 1985 introduced a third parameter, α, in the continuity equation to allow for the lateral movement of floodwater. Elfeki et. Al (2014) carry some modifications of the assumptions such that the negative sign of the parameter α represents transmission losses. In this research, the third-parameter α has been investigated as a tool for estimation of transmission losses using data from Yiba catchment in the Kingdom of Saudi Arabia. A spreadsheet model will be developed to deduce the equations.
Proceedings of the Second International Symposium on Flash Floods in Wadi Systems: Disaster Risk Reduction and Water Harvesting in the Arab Region (2016): 166-170
Representative elementary volume (rev) in porousAmro Elfeki
This presentation shows the concept of Representative elementary volume known in porous media. The presentation is the results of an excel spreadsheet prepared to generate hypothetical porous media in 2D. It calculates the porosity of the medium at different scales until it reaches the rev value.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
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About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
2. Central Limit Theorem
If we add a large number of uniform random numbers from the interval [0, 1] together, the sum
converges to normal distribution according to the central limit theorem.
An excel sheet is designed to preform such simulation.
The coming slides show the results of the excel sheet.
Each slide is the result of a summation of a number of a uniform random numbers.
The increase of the number of random numbers convers to the normal distribution.
![Central Limit Theorem
If we add a large number of uniform random numbers from the interval [0, 1] together, the sum
converges to normal distribution according to the central limit theorem.
An excel sheet is designed to preform such simulation.
The coming slides show the results of the excel sheet.
Each slide is the result of a summation of a number of a uniform random numbers.
The increase of the number of random numbers convers to the normal distribution.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)