• L'assurance accident, également connue sous le nom d'assurance accident ou blessure, signifie que l'assuré paie un certain montant de primes à la compagnie d'assurance. Lorsque l'assuré subit une blessure accidentelle au cours de la période d'assurance et cause directement le décès ou l'invalidité, la compagnie d'assurance doit suivre Le contrat d'assurance stipule que l'assuré ou le 意外保險 doit payer une certaine somme d'argent d'assurance. L'accident mentionné ici fait principalement référence à l'accident externe, non intentionnel, soudain, non pathologique causé.

    Quelle est la signification et la fonction de l'assurance accident?

    Qui sait ce qui se passera demain et qui sait ce qui arrivera en premier ? Cette phrase explique le mieux la signification des accidents. Les risques sont partout et ne peuvent être évités. Qui peut garantir qu'ils seront exempts d'accidents au cours de leur vie ? Les accidents causent souvent pertes énormes. , Les gens sont pris au dépourvu, notamment pour le pilier économique de la famille, ce qui va détruire la vie économique de la famille.

    L'assurance-accidents a plusieurs caractéristiques : des primes faibles, une incidence faible, un effet de levier de protection élevé et une protection élevée peuvent être exploitées avec de très faibles primes.

    Seuil bas pour l'assurance : Il n'y a pas beaucoup d'exigences en matière de santé pour l'assuré. Fondamentalement, tout le monde peut l'acheter pour maintenir la stabilité sociale. Il n'y aura pas autant de familles dont les familles sont détruites à cause de catastrophes naturelles et d'origine humaine

    Il est normal que la plupart des jeunes cols blancs travaillant dans les villes de premier rang portent des millions d'hypothèques, de prêts automobiles, de dettes de carte de crédit, etc. S'ils ont un accident, ils n'ont pas d'assurance accident et laissent des dettes élevées. la destruction de la famille originelle. Mais si une assurance accident est souscrite, au moins la famille peut maintenir une vie de base.

    En somme, les risques sont partout et inévitables. Nous devons prendre des mesures préventives à l'avance pour souscrire une assurance accident pour nous-mêmes et notre famille, et protéger notre santé en cas d'accident.

    Avantages de l'assurance :

    1. Face à la maladie, évitez de devenir pauvre à cause de la maladie et construisez un pare-feu pour vous et votre famille.

    2. Aux gens de ce pays. Assurez-vous qu'en aucune circonstance, il n'y aura aucune perte due à un accident, causez-vous une perte et évitez de tomber dans le désespoir.

    3. L'assurance pour enfants protège la planification et la croissance de l'éducation des enfants. Ayez pitié des parents du monde, combien d'adultes préféreraient souffrir eux-mêmes que leurs enfants.Assurer leurs enfants équivaut à lui laisser une somme d'épargne-études.

    La chose la plus importante est de planifier à l'avance. Lorsque vous êtes vieux et que vos cheveux sont gris, vous pouvez compléter tous les régimes d'assurance dès que possible, afin que vous puissiez prendre soin de la vieillesse, et profiter de votre vieillesse sereinement, afin que vous ayez une vieillesse digne, et vous permet d'avoir un sentiment de sécurité et de sûreté pour les personnes âgées.Sentiment de soutien.


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  • What's reflow soldering? Introduction into the principle and process of reflow soldering

    1. Precisely what is reflow soldering

     

    Reflow soldering is in English. Reflow is always to remelt the solder paste pre-distributed over the printed board pads to appreciate the mechanical and electrical relationship among the solder ends or pins in the area mount parts as well as the printed board pads. Brazing. Reflow soldering would be to solder the elements into the PCB board, and reflow soldering should be to mount the components to the floor. Reflow soldering relies on the result of hot airflow over the solder joints. The colloidal flux bodily reacts below a particular superior temperature airflow to obtain SMD soldering; the reason why it is actually known as "reflow soldering" is since the gas circulates within the soldering equipment to deliver large temperature to obtain soldering. purpose.

    The principle of reflow soldering is split into numerous descriptions:

    (Reflow soldering temperature profile)

    A. When the PCB enters the heating zone, the solvent and fuel while in the solder paste evaporate, and simultaneously, the flux from the solder paste wets the pads, component finishes and pins, plus the solder paste softens, collapses, and addresses the solder The pads isolate the pads and element pins from oxygen.

    B. In the event the PCB enters the heat preservation place, make the PCB and elements completely preheated to stop the PCB from out of the blue entering the welding substantial temperature region and harmful the PCB and factors.

    C. Once the PCB enters the soldering space, the temperature rises fast so that the solder paste reaches a molten state, as well as liquid solder wets, diffuses, diffuses, or reflows on the PCB pads, ingredient finishes and pins to form solder joints.

    D. The PCB enters the cooling zone as well as the solder joints are solidified; when the reflow soldering is completed.

    The operating principle of dual-track reflow soldering

    The dual-rail reflow oven can double the potential of the one dual-rail oven by processing two circuit boards in parallel at the same time. Presently, circuit board makers are confined to dealing with circuit boards from the very same or equivalent fat in each monitor. Now, the dual-track dual-speed reflow oven with unbiased orbital speeds causes it to be a actuality to process two more distinct circuit boards simultaneously. 1st, we'd like to understand the leading elements that influence the warmth transfer with the reflow oven heater to your circuit board. Beneath typical circumstances, as shown from the figure, the lover of the reflow oven pushes fuel (air or nitrogen) throughout the heating coil. Right after the gasoline is heated, it truly is sent to your solution by means of a sequence of holes from the orifice.

    The next equation can be employed to describe the procedure of warmth strength transfer in the airflow towards the circuit board, q = warmth vitality transferred to the circuit board; a = convective warmth transfer coefficient in the circuit board and factors; t = heating time on the circuit board; A = heat transfer area location ; |¡èT = the temperature difference between the convection fuel along with the circuit board. We shift the related parameters of the circuit board to 1 facet from the components, and shift the parameters in the reflow oven for the other facet, and also the next formulation is often acquired: q = a | t | A | | T

    Dual-track reflow soldering PCB is fairly common, and it progressively became more and more well known. The primary reason for it for being so popular is always that it provides designers with really fantastic elastic house, in order to style and design much more compact, compact and low-cost merchandise. As of nowadays, dual-rail reflow soldering boards generally possess the higher side (element side) soldered by reflow, and after that the lessen side (guide aspect) is soldered by wave soldering. A existing craze is towards dual-track reflow soldering, but you can find nonetheless some problems with this process. The bottom part on the large board may tumble off for the duration of the 2nd reflow procedure, or component of the underside solder joint could soften, triggering trustworthiness problems within the solder joint.

    2. Introduction to reflow soldering procedure

    The reflow soldering method is usually a surface-mounted board, and its course of action is a lot more intricate, which could be divided into two forms: single-sided mounting and double-sided mounting.

    A, single-sided mounting: pre-coated solder paste ?¨² patch (divided into guide placement and machine automated placement) ?¨² reflow soldering ?¨² inspection and electrical exam.

    B, double-sided placement: A side pre-coated solder paste ?¨² patch (divided into handbook placement and machine automated placement) ?¨² reflow soldering ?¨² B facet pre-coated solder paste ?¨² placement (divided into handbook placement and machine computerized placement) Mounting) ?¨² reflow soldering ?¨² inspection and electrical test.

    The simplest approach of reflow soldering is "screen printing solder paste-patch-reflow soldering. Its main is the precision in the monitor printing. For the patch, the generate fee is set with the machine's PPM. The reflow soldering is always to command the temperature increase and also the optimum Temperature and slipping temperature curve.

    Reflow soldering system demands

    Reflow soldering engineering is not unfamiliar inside the area of electronic production. The factors around the various boards employed in our computers are soldered to the circuit board via this method. The advantage of this method is the fact that the temperature is a snap to regulate, oxidation may be averted for the duration of the welding course of action, plus the producing expense is less complicated to manage. There is a heating circuit inside this gadget, which heats the nitrogen fuel to a large plenty of temperature and blows it to the circuit board where the element is previously hooked up, to ensure the solder on both equally sides of the component is melted after which bonded on the motherboard.

    1. It truly is important to set an inexpensive reflow soldering temperature curve and conduct real-time screening with the temperature curve consistently.

    two. The welding must be performed in accordance together with the welding direction of your PCB structure.

    3. Strictly reduce the conveyor belt from vibration for the duration of the welding process.

    four. The welding outcome of the first printed board have to be checked.

    five. Whether the welding is adequate, if the area in the solder joint is clean, whether the solder joint shape is half-moon shape, the condition of tin balls and residue, the condition of continual soldering and virtual soldering. Also examine for adjustments inside the colour of your PCB floor, and so on. And regulate the temperature curve based on the inspection results. The welding excellent must be checked frequently in the course of the entire batch creation approach.

    Aspects impacting the method:

    1. Normally, PLCC and QFP have a larger heat capability than the usual discrete chip part. It really is more challenging to weld large-area factors than smaller elements.

    two. Within the reflow oven, the conveyor belt is utilized to transfer merchandise for reflow, and simultaneously it becomes a warmth dissipation method. In addition, the warmth dissipation situations are distinctive among the edge and also the centre with the heating portion. The sting temperature is mostly reduced, except for the temperature of each and every temperature zone within the furnace. Furthermore towards the diverse prerequisites, the temperature of your identical load floor can also be distinctive.

    3. The impression of different merchandise hundreds. The adjustment of the temperature curve of reflow soldering ought to take into account that excellent repeatability is usually attained underneath no-load, load and different load variables. The load aspect is outlined as: LF=L/(L+S); the place L=the size in the assembled substrate and S=the interval of the assembled substrate. For reflow soldering procedure to obtain reproducible final results, the greater the load issue, the more difficult it truly is. Normally, the utmost load issue of your reflow oven is in the range of 0.5 to 0.9. This relies within the product or service circumstance (element soldering density, diverse substrates) and distinctive designs of reflow furnaces. To receive excellent welding outcomes and repeatability, realistic expertise is incredibly essential.

    Reflow soldering could be the core technologies with the SMT process. All of the digital factors to the PCB are soldered at one time by all round heating. The quality control of the SMT output line with the electronics factory accounts for an absolute component of the perform to obtain fantastic soldering quality. Soon after placing the temperature curve, the furnace is managed. This is something all PE is aware. Many files and components mention the setting of reflow soldering temperature curve. For a new products, new furnace, new solder paste, tips on how to immediately set the reflow soldering temperature curve? This demands us to have a basic knowing of your notion of temperature profile along with the principle of solder paste soldering.

    Related Links

    Why is it called reflow soldering and what exactly are the benefits of reflow soldering

    The part and performance of reflow soldering equipment, recognize

    Procedure method and procedure needs of reflow soldering device


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  • D'où viennent les cernes et pourquoi apparaissent-elles quand on est fatigué ?

    Quelle est donc la cause de ces demi-lunes sombres qui apparaissent sous nos yeux lorsque l’on est fatigué ? Si vous vous êtes toujours demandé d’où venaient les cernes, voici la réponse.

    Des cernes à cause des vaisseaux sanguins

    Aucune raison de vous inquiéter lorsque vous les voyez apparaître sous vos yeux fatigués 黑眼圈眼膜. Les cernes ne sont pas un symptôme clinique grave, à moins que vous décidiez de vous en faire une montagne ou que leur présence devienne envahissante dans votre vie. Ces cernes répondent à un nom bien plus chantant au sein du corps médical : hyperpigmentation périorbitaire.

    La raison pour laquelle ces marques apparaissent est à la fois génétique et environnementale d’après la dermatologue Carole Clinton interrogée par le site LiveScience. On les repère le plus souvent chez les personnes nées avec une peau claire ou pâle. Chez ces personnes 眼紋成因, la peau est plus transparente et laisse entrevoir ce qu’il se passe en-dessous.

    Lorsque l’on est fatigué ou stressé, la circulation sanguine autour de l’œil ralentit. Les vaisseaux très fins (capillaires) situés à la périphérie se gorgent alors de sang ce qui les amène à se dilater, et la région sous nos globes oculaires prend une teinte plus sombre. Hayley Goldbach de l’Université de Californie a pour habitude d’étirer la peau sous l’œil des patients qui viennent la consulter pour savoir ce qui cause l’hyperpigmentation.

    Vieillesse et mélanine

    Si le dessous de l’œil devient plus sombre, ce sont bien les vaisseaux en-dessous qui sont en jeu. Si en revanche le cerne devient plus clair, alors l’impression d’hyperpigmentation peut provenir d’un problème de souplessede l’épiderme. Quand un individu vieillit, la graisse sous sa peau disparaît, ce qui peut donner l’impression que cette dernière se creuse.

    C’est ce qu’il se passe dans le cas de la "vallée des larmes" 黑眼圈眼膜, ce léger sillon situé entre votre œil et votre nez. À mesure qu’elle se creuse, l’ombre qu’elle crée sous l’œil devient plus marquée et donne une impression d’hyperpigmentation. Dans cette situation, rien à voir avec les vaisseaux sanguins ou un pigment donc, il ne s’agit que d’une illusion d’optique.

    Sa couleur peut également aider à identifier l’origine d’un cerne. S’il est bleu, rose ou violet, les vaisseaux sanguins sont probablement responsables. En revanche, s’il est marron, on aura plutôt affaire à un excès de mélanine dans la peau, même si cette manifestation se révèle être assez rare. Et pour les poches, c’est une tout autre affaire. Quoi qu’il advienne, pas de raison de s’alarmer outre mesure.

    TAG:

    périorbitaire

    dermatologue

    hyperpigmentation


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  • Tired of your Valentine’s Day roses losing their luster by Feb. 15? Forget pennies in the water or the powder in those chemical preservative packets. (Getty Images/iStockphoto/Prostock-Studio)

    10 acres of flowers for Valentine’s Day

    Valentine’s Day is next Friday, and if you didn’t know that, this may be the most important “Garden Plot” you’ll ever read.

    Now, instead of giving flowers that eventually fade away, how about an event whose memories will last forever, such as a trip to the famed Philadelphia Flower Show next month?

    Philly is the largest indoor flower show in the world, with 10 acres of major exhibits and breathtakingly perfect individual plants 情人節花束. It’s also the oldest American flower show—the poinsettia was first seen in the United States at the premier show in 1829.

    This year’s theme, “Riviera Holiday,” promises a bit of Mediterranean warmth in the middle of winter. Buy your tickets early and get a break on the price (check out the “Friends and Family” deal) at www.phsonline.org/flowers.

    The flower that says, ‘I love you’

    So, are you ready to send the correct message next Friday, on Valentine’s Day?

    Red roses do symbolize “love” in general in “The Floral Code,” the “language of flowers” that was immensely popular in the Victorian Era, for a time when manners and station often prevented direct talk of romance and symbolism was the only socially acceptable way to express your feelings.

    But red tulips specifically mean “I love you.” And red tulips are reliable re-bloomers, so if you buy them as live plants growing in a pot and give the green leaves lots of sun, after the flowers fade, you can plant the bulbs in the ground this fall and aim for everlasting love.

    Don’t give the wrong roses

    You may want to avoid roses in colors other than the basic red.

    White roses symbolize chastity, which is, perhaps, not your intended point on Feb. 14.

    Peach roses mean sympathy, which might be what you’ll need, but don’t ask for it up front.

    Yellow roses might be the worst — that color translates to “let’s just be friends.” Oy!

    Oh, and don’t worry, if your red roses have a few thorns — the more thorns, the more passionate your love.

    The proven cut flower preserver

    Tired of your Valentine’s Day roses losing their luster by Feb. 15? Forget pennies in the water or the powder in those chemical preservative packets. Researchers whose work has been published in peer-reviewed journal articles recommend a different strategy:

    • First, thoroughly wash the vase the flowers will go into.
    • Then, mix one can of Sprite, 7-Up or other nondiet lemon-lime soda with three cans of water.
    • Add a few drops of vinegar.
    • Then, warm this mixture to around 100 degrees.
    • Remove any leaves that would fall below the water line.
    • Recut the stems at an angle, then place them in the still-warm water.
    • Display the vase in the coolest spot in your home.

    Get it all right and those flowers can look fabulous for two weeks!

    …and maybe toss in a shot for good luck

    An article published in The International Journal of Biotechnology Research contains some important Valentine’s Day information: namely that—as with many humans—sugar and alcohol may be key to success!

    The researchers found that keeping cut flowers looking good the longest requires some sugar for food, clean water with a low pH, an anti-microbial agent to keep the water clean and … a little vodka.

    Originally thought to kill microbes in the water, researchers found that the vodka actually prevented the release of ethylene gas, a natural ripening agent that would otherwise “push” the flowers into fully opening and dropping their petals prematurely.

    Drink up!

    Meet Mike in Chantilly later this month

    I’ll appear on Saturday, Feb. 22 and Sunday, Feb. 23 at the long-running Capital Remodel & Garden Show at the Dulles Expo Center in Chantilly, Virginia. Saturday talks will be at 1 p.m. and 4 pm; Sunday’s are noon and 2 p.m.

    I’ll talk about tomatoes, organic lawn care, compost and, of course, answer your toughest garden questions! More info here.

    Mike McGrath was editor-in-chief of ORGANIC GARDENING magazine from 1990 through 1997. He has been the host of the nationally syndicated public radio show “You Bet Your Garden” since 1998 and WTOP Garden Editor since 1999. Send him your garden or pest control questions at MikeMcG@PTD.net.


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  •  a very common

    Madeline did not go back to school. For some months she remained at home with the De Bernys; White, in his indolent way, postponing the question of where she was to go next.He was a good deal occupied at this time with the adaptation of a new play which was being acted with great success at the Porte St. Martin, and, as it was necessary to see the play represented by the French actors, he spent some weeks in Paris. He discovered that by carefully lopping the leading idea, making the chief female virtuous instead of vicious, altering the scenes, and turning the moral upside down, he could make the great drama pure enough for the sight of the British playgoer. His English manager approved, sent him a small cheque on account, and begged him ‘to do the trick’ as quickly as possible.

    At this period, therefore, Madeline was thrown more and more into the society of Mademoiselle Mathilde. That vision of loveliness found the child useful, sent her on endless errands, made of her a sort of companion in miniature, and extempore lady’s maid. Madeline was only too delighted to serve and worship, and great was her joy when any of the cast-off splendour fell to her share. One evening Madame de Berny took her to the theatre, on the occasion of her daughter’s ‘benefit.’ There was a serio-comedy in which Mathilde played the leading part, and a burlesque to follow, in which (for that occasion only, for she generally despised burlesque) she enacted a fairy prince. Madeline was entranced; the spell of the footlights came upon her once and for ever.

    That night, after they had returned home, and the Vision had supped well on oysters and bottled stout, Madeline proffered a request which had lately become one with her‘Oh, Mamzelle, let me brush your hair!’Mathilde took a sleepy sensuous pleasure in that part of her toilette, and would sit by the hour together under the soothing manipulation of the brush. So she let down her golden locks, and placed herself, with her eyes half closed, before the mirror, while Madeline began her task, prattling between whiles of the theatre, of all the wonders she had seen, and of the longing that would possess her until she saw them again.

    ‘I used to feel like you once,’ yawned Mathilde, ‘when I was a dear little thing, with my hair growing down to my waist, and little satin shoes on my feet, and Pa used to take me to the pantomimes. Ah, dear, that’s over and done. I hate the theatre.You hate it, Mamzelle?’‘Yes, and sometimes I hate Pa for ever letting me go nigh to it. I suppose it all comes of Ma marrying a Frenchman; for Pa used to teach me to say those long speeches in rhyme out of the French plays, and then I got a taste for recitation. But I hate French now, and I hate the theatre. It’s nothing but worry and vexation. There was only five pounds ten in the stalls to-night besides the tickets Pa and Ma sold, and the dress circle was not half full. Did you notice a dark fat man in a private box, who threw a bouquet to Miss Harlington?’


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