Lycée Blaise Pascal Rouen

Menu du 14/05/12 au 18/05/12

Isabelle FIGUEIREDO — 2012-05-14T05:27:54Z

LUNDI

Hors d'œuvre variés
Cuisse de poulet jaune à l'estragon/frites
Andouille au canard/flan de poireaux
Yaourt ou fromage
Dessert au choix

MARDI

Hors d'œuvre variés
Dos de colin lieu curry-crevettes/riz
Sauté de veau marengo/carottes jeunes
Yaourt ou fromage
Dessert au choix

MERCREDI

Hors d'œuvre variés
Cordon de dinde/petits pois maraîcher
Galopin de thon/chou-fleur gratiné
yaourt ou fromage
Dessert au choix

JEUDI

FÉRIÉ

VENDREDI

Hors d'œuvre variés
Omelette au gruyère/pâtes
Rôti de porc sauce au cidre/duo de courgettes
yaourt ou fromage
Dessert au choix

Informatique et Sciences du Numérique : une nouvelle spécialité pour les élèves de terminale S à la rentrée 2012

C. Devalland — 2012-05-11T19:32:18Z

Informatique et Sciences du Numérique (ISN)

Ce nouvel enseignement sera proposé aux élèves de terminale S du lycée au même titre que les enseignements de spécialité mathématiques, sciences physiques et chimiques et sciences de la vie et de la terre. A raison de 2 heures par semaine et plus pratique que théorique (cours, travaux pratiques et activités de projet), il propose une introduction à la science informatique : information numérique, algorithmes, langages, architectures. Il fait l'objet d'une évaluation orale en cours d'année et est affecté d'un coefficient 2 pour le baccalauréat.

Une présentation rapide de cette spécialité est accessible sur cette page.

Le programme complet de cette spécialité est disponible à cette page.

Enfin, le déroulement de l'évaluation en cours d'année est décrit par ce texte.

How do fireworks work ?

gregoirenoel — 2012-05-09T05:31:13Z

How do fireworks work ?

Black powder and the art of making explosions have been known by the Chinese since at least the eighth or nineth century. In Europe, black powder was brought back by Marco Polo from China. It has been used for firearms since 1346. The first real firework was fired at Anne of Austria and Louis XIII's wedding in 1615. It contained black powder, gold dust and silver dust.

Fireworks have been a traditional part of New Year's celebrations since they were invented by the Chinese almost a thousand years ago. Today fireworks displays are seen on most holidays. There are different types of fireworks. Firecrackers, sparklers, and aerial shells are all examples of fireworks. Though they share some common characteristics, each type works a little differently. Firecrackers are the original fireworks. In their simplest form, firecrackers consists of gunpowder wrapped in paper, with a fuse. A sparkler consists of a chemical mixture that is molded onto a rigid stick or wire. I will focus on the aerial shells through my presentation because when most people think of fireworks an aerial shell probably comes to mind as it is the most used at fireworks display.

Aerial shells

Aerial shells are one of the most beautiful and certainly one of the most complex types of fireworks. A shell consists of those main parts : a container, a lift charge, a time fuse, a burst charge, and stars/effects. The container, or shell casing, is a strong wall that protects the contents. The lift charge propels the shell out of the tube, and the time fuse ignites the burst charge at the right altitude. Then, the blast of the burst charge ignites the effects.

Shells are launched from a tube known as a mortar. A string loop is often attached to consumer firework shells so it can be lowered into the mortar by the fuse. When the fuse enters the lowest part of the shell – which contained the lift charge -, it ignites the lift charge, creating an explosion that ignites the time fuse and shoots the shell high into the air.

As the shell ascends, the time fuse burns towards the burst charge. At the precise altitude - which is determined by the length of the time fuse - usually where the shell is briefly hanging in the air - the time fuse ignites the black powder burst charge, causing the shell to explode. The powerful explosion blasts apart the shell casing and ignites the stars, scattering them in all directions across the sky. These stars burn brightly and give off sparks, creating a huge spherical pattern in the sky.

Black powder

A major component of fireworks is the black powder which is a combination of about 20% charcoal, 10% sulfur and 70% potassium nitrate or sodium nitrate. Black powder burns rapidly and produces a lot of gas. If this gas is confined in a tube it reaches very high pressures. This can be used to launch a firework into the air from a "mortar" which is a tube with one open end ; like a gun or cannon. It can also be used to make a rocket by allowing the gas to escape through a small hole at one end of at tube.

Redox reaction

Redox (portmanteau for reduction-oxidation) reactions refer to all chemical reactions in which atoms have their oxidation state changed.

Like acid-base reactions, redox reactions are a matched set, that is, there cannot be an oxidation reaction without a reduction reaction happening simultaneously. A redox couple consists of two chemical compounds which are the main involved during a redox reaction.

An oxidizer is an atom, ion or molecule able to capture one or more electrons.
A reducer is an atom, ion or molecule able to release one or more electrons.

The oxidation alone and the reduction alone are each called a half-reaction, because two half-reactions always occur together to form a whole reaction.

Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.

Combustion

Fireworks are based on combustion. Combustion is the sequence of exothermic chemical reactions between a fuel and an oxidizer (redox reactions) accompanied by the production of heat and conversion of chemical species. The release of heat can result in the production of light in the form of either glowing or a flame. The reaction starts with a transfer of electrons between the fuel and the oxidizer. Then the fuel atoms bind to oxygen atoms released by the oxidizer and release at the same time energy such as heat and light. In black powder, the fuel is charcoal and sulfur, the oxidizer and oxygen-producer is potassium nitrate.

Rate of reaction

If black powder is confined in a closed tube or container while it burns it will burst and spread the contents of the firework out in a large ball. Black powder does not technically explode : it just burns very fast. However if it is confined while it burns it can generate enough pressure and heat to do just as much damage as an explosion. The rate at which the powder burns can be controlled by how it is made, how much powder is used, and how it is confined. That helps manufacturers control how high fireworks go when they are launched from mortars or by rockets and how large a display they produce when they burst and spread the bright burning metal compounds inside.

Light and colors

Creating firework colors is very complex and requires considerable art and application of physical science. Excluding propellants or special effects, the points of light ejected from fireworks, termed 'stars', generally require an oxygen-producer, fuel, binder (to keep everything where it needs to be), and color producer. There are two main mechanisms of color production in fireworks, incandescence and luminescence.

Incandescence

Incandescence is light produced from heat. Heat causes a substance to become hot and glow, initially emitting infrared, then red, orange, yellow, and white light as it becomes increasingly hotter. When the temperature of a firework is controlled, the glow of components, such as charcoal, can be manipulated to be the desired color – determined upon the temperature reached - at the proper time - when the stars are ignited by the blast of the burst charge. Metals, such as aluminum, magnesium, and titanium, burn very brightly and are useful for increasing the temperature of the firework.

Luminescence

Luminescence is light produced using energy sources other than heat. Sometimes luminescence is called “cold light”, because it can occur at room temperature and cooler temperatures. To produce luminescence, energy is absorbed by an electron of an atom or molecule, causing it to become excited, but unstable. When the electron returns to a lower energy state the energy is released in the form of a photon (light). The energy of the photon determines its wavelength or color.

The energy exchanged between an atom and the external environment is quantified. That is to say it can take only certain discrete values of energy. To each atom corresponds a unique set of discrete energy levels. The level of lowest energy of an atom is associated to its stable state, called the ground state. The levels of higher energies are associated with the excited states of the atom. Thus, to each atom corresponds a characteristic spectrum and therefore a specific emission color.

For example : Strontium and Lithium are used to create a red burning firework. Calcium is used for orange while Sodium is used for yellow. Green is created by adding Barium while blue is created by adding Copper halides. A white color is emitted when Aluminum, Titanium, Beryllium or Magnesium. A gold color is created by adding charcoal or iron.

Les élèves de secondes GT4 et GT8 en sortie pédagogique au Centre Historique Minier du Nord-Pas de Calais

Degoyv — 2012-05-07T10:19:41Z

Ils ont abordé le thème « Energie » du programme de Sciences de la vie et de la Terre, ont compris l'origine du charbon, les implications (humaines et environnementales) de son extraction et plus généralement réfléchi à l'impact planétaire de l'utilisation des différentes énergies renouvelables ou non à notre échelle.

- 30. Actualités / Actualites

France unss en vue !!

lelionp — 2012-05-07T09:45:20Z

Mercredi 18 Avril

Qualification de l'équipe d'aviron du lycée aux championnats de France UNSS

le week-end du 20 Mai à Libourne.

BRAVO à tous les participants !!!

Rentrée 2012 : une option sportive en seconde

lelionp — 2012-05-07T09:37:12Z

Pour la rentrée de septembre , une option sportive est mise en place en classe de seconde. Cette option regroupe deux activités : Aviron et entretien physique /musculation.


Gerardmer 2009

Cette option s'adresse autant aux filles qu'aux garçons , débutants , confirmés ou pratiquants déjà d'un autre sport.

L'organisation hebdomadaire est de 2 h d'aviron et 1h d'entretien physique /musculation. Ce choix représente 3h00 supplémentaires en plus des deux heures d'EPS obligatoire , il faut donc bien planifier son travail.

Les objectifs sont :

-de découvrir , approfondir et progresser dans deux activités sportives

- de gagner des points au baccalauréat.

Après 3 années, l'élève présente une activité pour le Bac en option facultative, l'autre pouvant remplacer une des trois notes du bac EPS en contrôle en cours de formation (ccf)

-tendre vers un niveau d'expertise supérieur au niveau demandé en cours d'EPS obligatoire et participer aux championnats UNSS .


salle de musculation

Le profil, les exigences et les qualités requises correspondent à des élèves réussissant en EPS au collège et ayant, déjà , un projet post-bac (staps).

Il faut être curieux, motivé et sentir le besoin de pratiquer des activités physiques et sportive.

Il est nécessaire d'être volontaire et assidu pour s'investir dans les deux disciplines car une fois choisie , l'option devient obligatoire . L'élève doit aussi démontrer sa capacité à nager 50m (diplôme exigé).

L'inscription se fera lors de l'inscription en seconde début juillet où des enseignants pourront renseigner les élèves intéressés .

Les élèves de Premières S1 et S2 en vedette dans le quotidien « les Dernières Nouvelles d'Alsace »

Degoyv — 2012-04-23T07:31:10Z

Du 10 au 13 Avril 2012, une soixantaine d'élèves de 1re S ont parcouru les grands sites alsaciens dans un programme de visites alliant histoire, géographie, géologie, écologie, plaisir. La presse régionale s'en est fait l'écho. Quelques photos agrémentent la présentation. - 30. Actualités / Actualites

Menu du 07/05/12 au 11/05/12

Isabelle FIGUEIREDO — 2012-04-21T08:08:55Z

LUNDI

Hors d'œuvre variés
Jambonnette de poulet/purée
Dos de cabillaud sauce Dieppoise/duo de courgettes
Yaourt ou fromage
Dessert au choix

MARDI

FÉRIÉ

MERCREDI

Hors d'œuvre variés
Agneau à la marocaine/semoule couscous
Râble de lapin à la moutarde/haricots verts
yaourt ou fromage
Dessert au choix

JEUDI

Hors d'œuvre variés
Saumon frais crème oseille/riz
Brochette de poulet médina/brocolis fleurette
yaourt ou fromage
Dessert au choix

VENDREDI

Hors d'œuvre variés
Steak bavette à l'échalote/pâtes
Pavé de poisson blanc Bordelaise/thian provençale
yaourt ou fromage
Dessert au choix

Our Trip to England

C. Reymond, Coline Bodin — 2012-04-12T05:29:13Z

Our trip to England : evenings in the families

During our trip, we were hosted by families. We were two, three or four students by guest house, so we could help one another to discuss and communicate with the family.

The organization in the house was very different depending on the groups. In the morning, we woke up between 6:15 and 7:00 am, and we went to bed between 22:00 and midnight.

A lot of us ate alone ; the family didn't eat with us. Indeed, English people don't eat a meal with several courses, but they eat their main course at 6:00 pm, and eat another time at 8:00 or 9:00 pm. But often, they stayed with us to discuss, and they were curious about our life in France.

We didn't eat any special breakfasts with bacon and eggs, but cereals, toasts, and tea. However, in the evening, a lot of us ate baked beans, big garden peas, etc... But some of luckier students ate chips, pizzas and pastas.

Those families are used to hosting students so they often have some rooms especially for us. For example, those who were two or three in a family were in the same bedrooms, but with twin beds or a bunk bed, but those who were four in the same family were in two separate rooms.

We thank a lot the families for this great week, because even if sometimes their habits seemed quite strange to us (for example that they didn't eat together), it was a rewarding experience, and we are all happy to have lived it.

Edited by Eve-Anne Otero & Coline Bodin

Menu du 16/04/12 au 20/04/12

Isabelle FIGUEIREDO — 2012-04-12T05:27:32Z

LUNDI

Hors d'œuvre variés
Pavé de dinde méditerranéenne/purée
Dos de cabillaud à la crème/poêlé de légumes
Yaourt ou fromage
Dessert au choix

MARDI

Hors d'œuvre variés
Escalope de porc mariné coco-curry/carottes sautées oignons
Œufs durs à la crème/pâtes
Yaourt ou fromage
Dessert au choix

MERCREDI

Hors d'œuvre variés
Rôti de lapin aux pruneaux/haricots verts
Saucisse chipolatas/lentilles au jus
yaourt ou fromage
Dessert au choix

JEUDI

Hors d'œuvre variés
Saumonette Dijonnaise/riz
Brochette de dinde tomate basilic/flan de légumes
yaourt ou fromage
Dessert au choix

VENDREDI

Hors d'œuvre variés
Crabe farci/poêlée de ratatouille
Rôti de bœuf/pommes rissolées cubes
yaourt ou fromage
Dessert au choix