Youtube daily report May 19 2018

Roberto Firmino – Brazilian brains and brawn, made for Liverpool FC

For so much of Roberto Firmino's career at Liverpool Football Club, he has been defined by what he is not, writes Samuel Cox.

Hes not a centre-forward, he's not a goal scorer, he doesn't have pace, he's not top class, he's not Suarez, he's not Coutinho.

Well let me tell you what he is, Roberto Firmino is the best centre-forward in the league.

Firmino has always been rated highly by those inside the club, and he is the first on Jurgen Klopp's team sheet without exception.

While Christian Benteke and Daniel Sturridge were both bigger 'names' when Klopp arrived, both found themselves dislodged by Bobby.

Why? Because Roberto Firmino is a combination of brains and brawn, he'll press the defence then undress them as only a Brazilian can.

Bill Shankly once famously said, "I was made for Liverpool and Liverpool was made for me.

" I would argue Firmino was made for Klopp's Liverpool and Klopp's Liverpool was made for Firmino.

Klopp had a familiarity with Firmino from his knowledge of the Bundesliga and in him I have no doubt he saw the beginnings of his team, the start of a potential dynasty, a team built in his own image and worthy of Liverpool's illustrious past.

Klopp recognised a great player in a good players skin: Bobby's work rate is superhuman, putting in the defensive shift of a midfielder, yet making the attacking runs of a forward.

He is forever dropping deep, yet he simultaneously manages to gleefully charge into the box on every counter attack.

The stats reinforce what the eye says is true, Bobby is the only player in the Premier League this season to win over sixty tackles (65) and create more than fifty chances (53).

Indeed, from the big clubs, only Alexis Sanchez (41) comes even close to entering the same realm as Firmino.

Even the defenders from the top six clubs can't compete, with only Chelsea's Azpilicueta (80) besting him.

These unusual stats recognise Firmino as equal parts silk and steel.

Despite claims of Firmino 'not being a goal scorer', he arrived at Liverpool with a very respectable goalscoring record for a midfield player, continuing to enhance this aspect of his game.

The title of highest scoring Brazilian Premier League season ever now rests with Firmino, with fifteen goals and seven assists.

In the Champions League he has ignited with ten goals and another seven assists in just 12 games.

To paraphrase the great Hunter S.

Thompson, he is Klopp's own prototype, some kind of high-powered mutant never considered for mass production.

Bobby does not have electrifying pace, few do, but he does have speed and the running power to maintain it.

Our Number Nine will not beat a player over the first few steps but rather run down the cover and raid into the box unmarked on the counter.

When speed and determination don't suffice, Firmino uses his superior touch and judgement.

He can bring a ball down from the heavens with a nonchalant feathering of the boot.

He also has phenomenal judgement on where to position himself to wreak havoc.

At a glance, Firmino appears every inch the new age player, personifying so many terms in the new techno-football lingo: 'operating between the lines,' 'false nine,' 'gegenpressing.

' This is no illusion, he is an incredibly smart player, often cutting off two or three passing options by utilising angles to ruthlessly close the opposition players.

However, he is in many ways a throwback, a call to Liverpool's monolithic past.

Liverpool has remained a working-class club, where hardworking players are beloved.

The great Liverpool dynasty's, from Bill Shankly onwards, epitomised a team-first mentality.

It was in their blood; a mentality Roberto Firmino inhabits.

If that was all I had to say on the matter I could quite rightly rest my case, but what truly elevates Firmino is something less statistically tangible: his tactical interplay.

Firmino improves the whole forward line, he turns it into a fluid, multi-headed beast.

Bobby drops deep, he pulls out wide, he starts the press, he wins the ball back in our defensive half and then burns towards the goal on the counter-attack.

He does it all and crucially he does it more than any other forward in England.

This turns Liverpool into a footballing Hydra; cut off the head and two more replace it.

This is what makes Firmino potentially the best centre-forward in Europe; he transforms Liverpool into a practically unstoppable attack.

It is no coincidence that Sadio Mane and Mo Salah have enjoyed career-best form since donning the famous red shirt.

It is the unpredictable dynamism which Firmino infuses, dovetailing in beautiful fluidity with his partners in crime.

For more infomation >> Roberto Firmino – Brazilian brains and brawn, made for Liverpool FC - Duration: 7:16.

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Rocket Science E07 - Hybrid Propulsion - Duration: 9:31.

Hybrid engines use both a solid propellant and a liquid or gaseous propellant.

For instance, a solid fuel is stored in the combustion chamber and a liquid oxidizer is

added from a tank.

Usually it's the fuel that's solid, but it can also be the other way around.

The advantage of having a liquid oxidizer is that it's safer and more efficient than

having a liquid fuel.

A valve is used to control the flow of the oxidizer.

The valve controls how fast the oxidizer is allowed to interact with the fuel, meaning

that it can control the thrust.

Before the liquid propellant enters the chamber, it passes an injector to atomize the liquid,

essentially turning it into tiny pieces.

This is necessary to get a stable and homogeneous burn without the chaos you would expect of

a liquid.

The liquid propellant is pushed into the combustion chamber using an inert gas tank or a turbopump

system, just as is the case with liquid propulsion.

The turbine of such a turbopump system can be powered in a number of ways.

A solid rocket motor can be used for instance.

A bit of an odd application of hybrid engines is the Bloodhound SSC.

This vehicle will attempt to reach 1,000 mph, breaking the current land speed record of

763 mph, set by the same group of people in 1997.

Here we have a tank carrying about 2100 lbs of hydrogen peroxide.

This will act as the oxidizer of the hybrid propulsion system.

Notice how there are these perforated walls inside of the tank.

Some tankers have these too.

They help evenly distribute the force from the sloshing liquid across the wheels.

Here we see the oxidizer pump.

It will be spinning at about 10,000 RPM.

Here we have a better view of the impeller.

It has 3 inducers at the top which split into 6, then 12 and eventually 24 separate blades.

The pump is driven by a 550 break horsepower supercharged Jaguar V8 engine that can somehow

run at 18,000 RPM.

Here we see the rather long hybrid motor.

Long motors have a high surface area grain that doesn't burn for very long.

This results in higher thrust for a shorter period of time.

Less burn time is useful because then the drag of the air and wheels doesn't have

time to slow down the vehicle as much, so the top speed goes up.

The vehicle is also powered by a jet engine which takes it to about 650 mph.

A butterfly valve opens allowing the pump to fill up with hydrogen peroxide from the

tank.

The pump and engine are linked.

The clutch is still disengaged.

A small amount of hydrogen peroxide now passes the injector and the hybrid engine starts

burning.

Now the engine racks up from 3,000 to 18,000 RPM.

The clutch engages and the pump rapidly accelerates.

Now the hybrid motor is at maximum thrust, accelerating the vehicle to 1,000 mph.

Let's go over the advantages and disadvantages of a hybrid engine.

We'll start with the advantages.

The valve is used to control the thrust.

By closing the valve entirely, the engine can also be shut off completely.

Solid rocket propulsion can't do this.

Liquid and hybrid propulsion can.

The manufacturing process of a hybrid propulsion system is safer than that of a solid propulsion

system.

In solid propulsion, the fuel and oxidizer are mixed.

A spark can ignite the propellant.

Here we have a video of the boosters of NASA's Space Launch System being molded.

This is a very dangerous process.

In hybrid propulsion, the fuel and oxidizer are separate.

If the fuel is ignited, it only has the oxygen in the air to burn.

The burning is a lot slower, if there is any burning at all.

This makes the manufacturing process of hybrid propulsion much safer.

Hybrid propulsion is simpler than liquid propulsion, but more complex than solid propulsion.

The cost lies somewhere between those of solid and liquid propulsion.

Now, solid fuels tend to be denser than liquid fuels.

Let's take a look at some examples of fuel densities.

In model rocketry sucrose sugar is often used as a fuel, which has a density of about 1.59

grams per cubic centimeter.

The most popular liquid fuel is RP-1.

It's a sort of refined petroleum very similar to jet fuel.

This one's density is merely 0.81 grams per cubic centimeter.

Other liquid fuels like liquid methane, which is getting some popularity and liquid hydrogen

are much less dense still.

Hybrid propulsion takes up less space than liquid propulsion does due to the higher density

of the fuels.

This is a major advantage.

Hybrid propulsion can be very efficient.

Much more efficient than solid propulsion.

This is because the most efficient oxidizers are the liquid ones.

Primarily liquid oxygen, but also liquid fluorine.

In solid propulsion the oxygen is bonded to other atoms so that it remains a solid, which

results in a loss in efficiency.

For example, in model rocketry potassium nitrate is used as the oxidizer and sucrose sugar

as the fuel.

Three oxygen atoms are bonded to a nitrogen and a potassium atom.

The additional potassium and nitrogen atoms are required to keep the material solid.

In liquid propulsion there's no need for these additional atoms.

Take liquid hydrogen fuel and liquid oxygen oxidizer, for instance.

The oxidizer is just the oxygen in liquid form.

The efficiency, just as the cost, typically lies between solid and liquid propulsion.

As a reminder, by a high efficiency we mean a high velocity of the exhaust gas.

The efficiency does vary a lot depending on the mixture ratio, meaning the fuel to oxidizer

ratio.

When the mixture ratio is far from ideal for the reaction, so when the system is throttled

down significantly using the valve, the efficiency is low.

We can see this on the graph.

Along the horizontal axis we have the mixture ratio.

When it is very low, so on the left side, the efficiency is also low.

Also notice how different fuels have different curves.

The grains used in hybrid propulsion tend to be quite complicated.

The result is that some of the solid propellant is usually left unburnt.

This is unfortunate, because that unburnt propellant would have resulted in significant

acceleration since the mass is low at engine cutoff.

The best hybrid propulsion grains are borderline impossible to mold.

3D-printing does allow to make them, but then size and fuel choice become a problem.

Still, the technology might see large-scale application in the future as 3D-printing advances.

So, here is a picture of a transparent 3D-printed grain.

It uses a sort of double helix design which has a large surface area, so a high thrust,

but still consists of very little empty space, so it has a high density as well.

High thrust and high density make it ideal, but it's clearly not feasible to mold.

The Space Ship One aircraft was the first privately funded program to get a human to

space.

It was able to carry 3 people.

Space Ship One attached to another aircraft called White Knight One to lift off.

At 50,000 feet, the two separated.

Space Ship One would use a hybrid engine to get to space, which is defined as 100 kilometers

altitude.

Both Space Ship One and White Knight One were able to land and be rapidly reused.

About a month ago as of this video, a newer version of this aircraft called VSS Unity

had a successful test flight.

Virgin Galactic, the company now developing it, wants to use it to take customers on trips

to space.

After detaching from VMS Eve, VSS Unity reached a speed of 1,400 mph in about 30 seconds.

The next episode will be about orbits.

Thanks for watching.

Feel free to like and subscribe if you enjoyed the video.

I have a Patreon in case you'd like to support me.

Can follow me on twitter too.

The sources for this video and other links are in the description.

I'll see you next time!

For more infomation >> Rocket Science E07 - Hybrid Propulsion - Duration: 9:31.

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✅ Minister: Hovedstaden skal være grøn og erhvervsvenlig - Duration: 3:52.

En stærk hovedstad skal agere vækstmotor for resten af landet, mener Brian Mikkelsen

København. Efter flere år med fokus på at skabe vækst i provinsen går regeringen nu i gang med at formulere en politik for udvikling af hovedstaden

Hvad den skal indeholde, er ikke fastlagt. Men hovedlinjerne er, at hovedstaden skal være mere grøn og erhvervsvenlig

Det forklarer erhvervsminister Brian Mikkelsen (K), der står i spidsen for arbejdet

- Jeg køber ikke by-land-retorikken om, at hovedstaden og resten af landet står i modsætning til hinanden

Det er ikke dårligt for resten af landet, hvis hovedstaden styrkes, siger Mikkelsen

- Tværtimod er en stærk hovedstad en vækstmotor for hele landet.Ministeren nævner, at cirka 40 procent af Danmarks bruttonationalprodukt skabes i hovedstaden

Og det er hovedstadsområdet, der tiltrækker 85 procent af de udenlandske investeringer

Regeringens hovedstadspolitik skal rette sig mod alle 34 kommuner i hovedstadsområdet, oplyser Mikkelsen

Regeringen vil skabe mere vækst og viden i hovedstadsområdet. Der skal gøres plads til 200

000 flere borgere. Der skal gøres noget ved infrastrukturen. Og endelig skal hovedstadsområdet være mere grønt og have renere luft

Hvad det nærmere bestemt vil indebære, om det for eksempel skal være et forbud mod dieselbiler, vil erhvervsministeren ikke lægge sig fast på endnu

Han vil dog godt afsløre, at muligheden for at tiltrække mere udenlandsk arbejdskraft er noget af det, som regeringen overvejer

Hovedstadspolitikken skal også ses som et opgør mod den "københavner-bashing", som Brian Mikkelsen mener har fundet sted

- Den er kommet til udtryk i en underlig retorik om, at der skulle være en modsætning mellem hovedstaden og resten af landet, siger Mikkelsen

- Lad os viske det rent og komme videre, lyder opfordringen fra erhvervsministeren

Opfordringen får en tøvende modtagelse af Københavns overborgmester, Frank Jensen (S)

- Det er klart, at man er en lille smule sky som Københavns overborgmester. Hver eneste gang regeringen har stukket hånden frem, er det for at tage penge fra og ikke for at samarbejde med os, siger han

- Jeg vil gerne tro på det, at det ikke kun er skåltaler, og fordi der snart skal være folketingsvalg, siger Frank Jensen

Han håber, at den nye hovedstadspolitik blandt andet vil indeholde en udfasning af dieselbiler - også personbiler - da de er skyld i meget luftforurening

/ritzau/