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Rule of Thirds – Top 5 Tips for Photographers

What differentiates an amateur photographer and a professional is not the mastery of technical details. A good photographer knows how to compose an image well. There are many rules of composition; we will study one of the most commonly used ones. And that composition rule is called the rule of thirds.

Rule of Thirds

The rule of thirds means that you have to place your subject at any one-third of the image frame. Most of the cameras these days have an option to display various types of grids. The grid that is the most common is the 3*3 grid. So, the points where the lines meet is the point where your subjects should be placed. You would have to consider other factors along with it. Placing an image randomly on any of the points will not make an image great. Give it some thought on which point would make the most sense.

Here are some tips for you to learn and master this rule.

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Big Oh(O) Big Theta(Θ) Big Omega(Ω)

big O Notation

Analysis of Algorithms

Big O notation is a mathematical notation that describes the limiting behavior of a function when the argument tends towards a particular value or infinity. It is a member of a family of notations invented by Paul Bachmann, Edmund Landau, and others, collectively called Bachmann–Landau notation or asymptotic notation.

Big Oh Running Time Complexity
Big Oh Running Time Complexity

Two simple concepts separate properties of an algorithm itself from properties of a particular computer, operating system, programming language, and compiler used for its implementation. The concepts, briefly outlined earlier, are as follows:

The input data size, or the number n of individual data items in a single data instance to be processed when solving a given problem. Obviously, how to measure the data size depends on the problem: n means the number of items to sort (in sorting applications), number of nodes (vertices) or arcs (edges) in graph algorithms, number of picture elements (pixels) in image processing, length of a character string in text processing, and so on.

The number of elementary operations taken by a particular algorithm, or its running time. We assume it is a function f(n) of the input data size n. The function depends on the elementary operations chosen to build the algorithm.

Algorithms are analyzed under the following assumption: if the running time of an algorithm as a function of n differs only by a constant factor from the running time for another algorithm, then the two algorithms have essentially the same time complexity. Functions that measure running time, T(n), have nonnegative values
because time is nonnegative, T(n) ≥ 0. The integer argument n (data size) is also nonnegative.

Definition 1 (Big Oh)

Big Oh Rank Meaning
Big Oh Rank Meaning

Let f(n) and g(n) be nonnegative-valued functions defined on nonnegative integers n. Then g(n)is O(f(n)) (read “g(n)is Big Oh of f(n)”) iff there exists a positive real constant c and a positive integer n0 such that g(n) ≤ c f(n) for all n > n0.

Note. We use the notation “iff ” as an abbreviation of “if and only if”.

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QPR – Three Steps Anyone Can Take to Save a Life

What is QPR?

QPR logo
QPR

QPR stands for Question, Persuade and Refer — three simple steps anyone can learn to help save a life from suicide.

Our Mission

To save lives and reduce suicidal behaviors by providing innovative, practical and proven suicide prevention training. We believe that quality education empowers all people, regardless of their background, to make a positive difference in the life of someone they know.

What does QPR mean?

QPR stands for Question, Persuade, and Refer — the 3 simple steps anyone can learn to help save a life from suicide.

Just as people trained in CPR and the Heimlich Maneuver help save thousands of lives each year, people trained in QPR learn how to recognize the warning signs of a suicide crisis and how to question, persuade, and refer someone to help. Each year thousands of Americans, like you, are saying “Yes” to saving the life of a friend, colleague, sibling, or neighbor.

QPR can be learned in our Gatekeeper course in as little as one hour.

What is a Gatekeeper?

According to the Surgeon General’s National Strategy for Suicide Prevention (2001), a gatekeeper is someone in a position to recognize a crisis and the warning signs that someone may be contemplating suicide.

Gatekeepers can be anyone, but include parents, friends, neighbors, teachers, ministers, doctors, nurses, office supervisors, squad leaders, foremen, police officers, advisors, caseworkers, firefighters, and many others who are strategically positioned to recognize and refer someone at risk of suicide.

Read more-Partial Source: https://qprinstitute.com/about-qpr

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NPK Ratio

flower garden

The N-P-K ratio is the percentage by volume of nitrogen (chemical symbol N), phosphorus (P), and potassium (K) in fertilizer. A 16-16-16 fertilizer, for example, contains 16% nitrogen, 16% phosphorus, and 16% potassium.

NPK ratio
NPK ratio

How is NPK Calculated?

To calculate the pounds of nitrogen in a bag of fertilizer, multiply the weight of the bag by the percent nitrogen (this is the first number in the N-P-K designation on the front of the bag). Then divide the pounds of nitrogen by the area the bag states it will cover to get the pounds of nitrogen per 1,000 sq. ft.

Roles of NPK

The first number of the ratio indicates the amount of nitrogen in the fertilizer. Nitrogen serves a few different roles but its primary benefit to grass is to help produce lush, green leaves. The second element is phosphorus, which is focused on more of the downward growth and fuels important developments such as root growth. The final nutrient represented in the ratio is potassium. This particular nutrient focuses more on resistance. If you already have an established lawn that’s starting to suffer from stress or diseases then the application of potassium is crucial to the health of the grass.

n-p-k
n-p-k

What’s the Best Ratio?

The NPK ratio represents is the percentage of nitrogen (N), phosphorus (P), and potassium (K) in the fertilizer. So how do you what’s best for what ratio? Here are some basic rules to follow. If you are starting a new lawn then get lawn fertilizer that has a higher percentage of phosphorus and potassium. At this stage, it’s important to focus on root development and disease resistance.

If you are installing a new layer of sod then apply a similar ratio to what you would use for new lawns. Although new sod does have established grass, the roots themselves have been shaved off so it is vital to up the amount of phosphorus in the soil for root development purposes.

Finally, if you are well into the gardening season and have an established lawn then focus on using a fertilizer that has a higher composition of nitrogen. Before Using Lawn Fertilizer perform a test to determine the amount of nutrients that already exist in the soil. This can be done on your own through the use of NPK soil test kit.

Partial Source: http://www.jgilorganic.com/npk-lawn-care/

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Three ways to insert CSS – cascading style sheets

cascading style sheets

CSS How To…


When a browser reads a style sheet, it will format the HTML document according to the information in the style sheet.

working with CSS
working with CSS

Three Ways to Insert CSS

There are three ways of inserting a style sheet:

  • External style sheet
  • Internal style sheet
  • Inline style

External Style Sheet

With an external style sheet, you can change the look of an entire website by changing just one file!

Each page must include a reference to the external style sheet file inside the <link> element. The <link> element goes inside the <head> section:

Example

<head>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>
Try it Yourself »

An external style sheet can be written in any text editor. The file should not contain any html tags. The style sheet file must be saved with a .css extension.

Here is how the “mystyle.css” looks:

body {
  background-color: lightblue;
}

h1 {
  color: navy;
  margin-left: 20px;
}

Note: Do not add a space between the property value and the unit (such as margin-left: 20 px;). The correct way is: margin-left: 20px;


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Content Delivery Network (CDN)

A content delivery network or content distribution network (CDN) is a geographically distributed network of proxy servers and their data centers. The goal is to provide high availability and high performance by distributing the service spatially relative to end-users. CDNs serve a large portion of the Internet content today, including web objects (text, graphics and scripts), downloadable objects (media files, software, documents), applications (e-commerce, portals), live streaming media, on-demand streaming media, and social media sites.

Global content delivery network
Global content delivery network

Google Hosted Libraries

The Google Hosted Libraries is a stable, reliable, high-speed, globally available content distribution network for the most popular, open-source JavaScript libraries.

Google works directly with the key stakeholders for each library effort and accepts the latest versions as they are released.

Libraries

To load a hosted library, copy and paste the HTML snippet for that library (shown below) in your web page. For instance, to load jQuery, embed the 

<script src=”https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js“></script>

snippet in your web page.

We recommend that you load libraries from the CDN via HTTPS, even if your own website only uses HTTP. Nowadays, performance is fast, and caching works just the same. The CDN’s files are served with CORSand Timing-Allow headers and allowed to be cached for 1 year.

Global content delivery network
Global content delivery network

Best CDN Providers To Speed Up A Website

  • Cloudflare. Cloudflare is a highly reliable CDN service provider for protecting your website and boosting its performance even under Free plans. … 
  • MaxCDN. … 
  • Cachefly. … 
  • Rackspace. … 
  • Key CDN. … 
  • Akamai. … 
  • Amazon CloudFront. … 
  • jsDelivr.
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Fresh air with three plants – How to grow fresh air

With its air-filtering plants and sustainable architecture, Kamal Meattle’s office park in New Delhi is a model of green business. Meattle himself is a longtime activist for cleaning up India’s air.

– Kamal Meattle

Researcher Kamal Meattle shows how an arrangement of three common houseplants, used in specific spots in a home or office building, can result in measurably cleaner indoor air.

How to grow fresh air Kamal Meattle

Areca Palm, Mother-in-law’s Tongue, Money Plant
Areca Palm, Mother-in-law’s Tongue, Money Plant

Source: www.ted.com/talks/kamal_meattle_on_how_to_grow_your_own_fresh_air

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Three ways to see an atom

Atom

A remarkable photo of a single atom trapped by electric fields has just been awarded the top prize in a well-known science photography competition. The photo is titled “Single Atom in an Ion Trap” and was shot by David Nadlinger of the University of Oxford
A remarkable photo of a single atom trapped by electric fields has just been awarded the top prize in a well-known science photography competition. The photo is titled “Single Atom in an Ion Trap” and was shot by David Nadlinger of the University of Oxford.

If there is no way in the world to see an atom, then how do we know that the atom is made of protons, electrons, neutrons, the nucleus and the electron cloud?

There are three ways that scientists have proved that these sub-atomic particles exist. They are direct observation, indirect observation or inferred presence and predictions from theory or conjecture.

Atomic model
Atomic model

Scientists in the 1800’s were able to infer a lot about the sub-atomic world from The Periodic Table of Elements by Mendeleyev gave scientists two very important things. The regularity of the table and the observed combinations of chemical compounds prompted some scientists to infer that atoms had regular repeating properties and that maybe they had similar structures.

 

J.J. Thompson
J.J. Thompson

Other scientists studying the discharge effects of electricity in gasses made some direct discoveries. J.J. Thompson was the first to observe and understand the small particles called electrons. These were called cathode rays because they came from the cathode, or negative electrode, of these discharge tubes. It was quickly learned that electrons could be formed into beams and manipulated into images that would ultimately become television. Electrons could also produce something else. Roentgen discovered X-rays in 1895. His discovery was a byproduct of studying electrons. Protons could also be observed directly as well as ions as “anode” rays. These positive particles made up the other half of the atomic world that the chemists had already worked out. The chemists had measured the mass or weight of the elements. The periodic chart and chemical properties proved that there was an atomic number also. This atomic number was eventually identified as the charge of the nucleus or the number of electrons surrounding an atom which is almost always found in a neutral, or balanced, state.

Ernest Rutherford
Ernest Rutherford

Rutherford proved in 1911, that there was a nucleus. He did this directly by shooting alpha particles at other atoms, like gold, and observing that sometimes they bounced back the way they came. There was no way this could be explained by the current picture of the atom which was thought to be a homogeneous mix. Rutherford proved directly by scattering experiments that there was something heavy and solid at the center. The nucleus was discovered. For about 20 years the nucleus was thought to consist of a number of protons to equal the atomic weight and some electrons to reduce the charge so the atomic number came out right. This was very unsettling to many scientists. There were predictions and conjectures that something was missing.

James Chadwick
James Chadwick

In 1932 Chadwick found that a heavy neutral particle was emitted by some radioactive atoms. This particle was about the same mass as a proton, but it had a no electric charge. This was the “missing piece” (famous last words). The nucleus could now be much better explained by using neutrons and protons to make up the atomic weight and atomic number. This made much better sense of the atomic world. There were now electrons equal to the atomic number surrounding the nucleus made up of neutrons and protons.

Wilhelm Conrad Röntgen raggi X
Wilhelm Conrad Röntgen raggi X

Mr. Roentgen’s x-rays allowed scientists to measure the size of the atom. The x-rays were small enough to discern the atomic clouds. This was done by scattering x-rays from atoms and measuring their size just as Rutherford had done earlier by hitting atoms with other nuclei starting with alpha particles.

Cyclotron - 1930 particle accelerator
Cyclotron – 1930 particle accelerator

The 1930’s were also the time when the first practical particle accelerators were invented and used. These early machines made beams of protons. These beams could be used to measure the size of the atomic nucleus. And the search goes on today. Scientists are still filling in the missing pieces in the elementary particle world. Where will it end? Around about 1890, scientists were lamenting the death of physics and pondering a life reduced to measuring the next decimal point! Discoveries made in the 1890’s proved that the surface had only been scratched.

Carbon Atomic Model
Carbon Atomic Model

Each decade of the 1900’s has seen the frontier pushed to smaller and smaller objects. The explosion of knowledge has not slowed down and as each threshold has been passed the amount of new science seems to be greater even as we probe to smaller dimensions. Current theories (if correct) imply that there is even more below the next horizon awaiting discovery

Text Author: Paul Brindza, Experimental Hall A Design Leader

Source: https://education.jlab.org/qa/history_04.html
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3-click rule — the magic number – UX Collective

3-click rule — the magic number

A maximum of information in a minimum of words.

UI UX design
UI UX design

This is a particularly deep belief for your graphic designer friends for 10 years, but we have come a long way, and the usability tests have shown it for a while…

I will not lie to you any longer, users of your services will not leave your site or application if they can not find the information they are looking for in 3 clicks.

The number of clicks needed does not affect the success rate and even less the satisfaction of users: the important thing is to have a smooth, easy and understandable navigation (yes, the rules of 3 adjectives affect me too).

The scent of information

The concept is a simple idea and quite primitive as the name suggests : to have a good hunt, you must follow a good smell!

On a website or an application, the smell will take shape with the content, scented with confidence, the right word, the good image.

A little like my previous article about form field (Form fields — Required vs Optional), never forget that the most important thing when designing a product is to give the user the feeling of being in the center of all the expectations.

It’s a bit like setting a trap for a hungry bear, bait him, feed him to your final goal and he will follow you without even realizing it.

The key is your content: put it in value, coated to bring your user to be tempted to immerse himself in it and especially not let him lose The scent of information !

Once lost, the user hesitates, it becomes difficult for him to finish the action, and he will eventually notice the number of clicks you ask him to do.

Do not waste time worrying about the number of clicks, worry about the scent of information.

Disclamer :

I already see the crowd of designer dissatisfied ‘yes that’s fine theory, but when you can do 2 click instead of 6 is better no?’

YES, of course, this article is meant to make you think, to give you concrete information about the different studies done about the 3 clicks rule, but do not get me wrong, when you can do 2 clicks instead of 6 without spoiling the navigation experience, made it, but do not forget The scent of information.

Jordane SamsonJordane Samson
Head of design @gojob - 
#UX provider. For more from jordane sanson and to follow him select the link below: https://medium.com/@JordaneSanson/followers
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Buckminster Fuller explains threeness in the Universe

Buckminster Fuller

Buckminster Fuller
Buckminster Fuller

Buckminster Fuller

  1. The stability of the triangle
  2. The one quantum created in the tetrahedron
  3. How the icosahedron, the octahedron and tetrahedron create everything in the universe

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ORM – object relational mapping

Object Relational Mapping
Object Relational Mapping

ORM (Object-relational mapping) in computer science is a programming technique for converting data between incompatible type systems using object-oriented programming languages. This creates, in effect, a “virtual object database” that can be used from within the programming language.
Source: Wikipedia
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Difference Between Fartlek, Tempo, and Interval Runs? | Runner’s World

Speed Play - The Fun of Fartlek

Here’s a quick breakdown of these three major types of speed workouts.

Fartleks, That’s fun to say
Fartleks, That’s fun to say. Elf.

Hi Jenny, I just read your article, ‘What Should I Do During the Off Season?’. Very helpful, thanks! Could you briefly explain to me the difference between fartlek, tempo, and interval runs? Thanks! Mary

Hi, Mary. Thanks for the kudos. Ask and you shall receive: Here is a brief 411 on fartlek, tempo, and interval workouts.

Fartlek Workouts are not only fun to say out loud, but they’re fun to run. Fartlek is Swedish for “speed play,” and that is exactly what it’s all about. Unlike tempo and interval work, fartlek is unstructured and alternates moderate-to-hard efforts with easy throughout. After a warmup, you play with speed by running at faster efforts for short periods of time (to that tree, to the sign) followed by easy-effort running to recover. It’s fun in a group setting as you can alternate the leader and mix up the pace and time. And in doing so, you reap the mental benefits of being pushed by your buddies through an unpredictable workout. The goal is to keep it free-flowing so you’re untethered to the watch or a plan, and to run at harder efforts but not a specific pace.

Benefits: Stress-free workout that improves mind-body awareness, mental strength, and stamina.

Tempo Workouts are like an Oreo cookie, with the warmup and cooldown as the cookie, and a run at an effort at or slightly above your anaerobic threshold (the place where your body shifts to using more glycogen for energy) as the filling. This is the effort level just outside your comfort zone—you can hear your breathing, but you’re not gasping for air. If you can talk easily, you’re not in the tempo zone, and if you can’t talk at all, you’re above the zone. It should be at an effort somewhere in the middle, so you can talk in broken words. Pace is not an effective means for running a tempo workout, as there are many variables that can affect pace including heat, wind, fatigue, and terrain. Learn how to find your threshold and run a tempo workout that is spot on every time here.

Benefits: Increased lactate threshold to run faster at easier effort levels. Improves focus, race simulation, and mental strength.

Interval Workouts are short, intense efforts followed by equal or slightly longer recovery time. For example, after a warmup, run two minutes at a hard effort, followed by two to three minutes of easy jogging or walking to catch your breath. Unlike tempo workouts, you’re running above your red line and at an effort where you are reaching hard for air and counting the seconds until you can stop—a controlled fast effort followed by a truly easy jog. The secret is in the recovery as patience and discipline while you’re running easy allows you to run the next interval strong and finish the entire workout fatigued but not completely spent. Just like rest, your body adapts and gets stronger in the recovery mode.

Benefits: Improved running form and economy, endurance, mind-body coordination, motivation, and fat-burning.

Happy Trails.

* * *

You can ask Coach Jenny a running question on the Ask Coach Jenny Facebook Page or email your question here. Follow her on Twitter @coachjenny.

—Source: www.runnersworld.com/training/a20852351/whats-the-difference-between-fartlek-tempo-and-interval-runs/